diff --git a/CHANGELOG.md b/CHANGELOG.md
index c8f41ae5..ff192761 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,14 +2,15 @@
 
 ## v0.2.12
 
+- :tada: Feat: add PWA support
 - :bug: Fix: add scroll-margin to headerlink
+- :bug: Fix: Check if content is empty beforing passing
 - :fire: Feat: remove lib smooth-scroll ([#1](https://github.com/Lruihao/FixIt/issues/1))
 - :lipstick: Style: change scroll-behavior to smooth
 - :lipstick: Style: page image margin
 - :arrow_up: Chore: update all third-party libraries
 - :wrench: Chore: minify card-link background image
 - :wrench: Chore(i18n): change some translations
-- :bug: Fix: Check if content is empty beforing passing
 
 ## v0.2.11
 
diff --git a/assets/js/theme.min.js b/assets/js/theme.min.js
index 568d6b42..2413f9ed 100644
--- a/assets/js/theme.min.js
+++ b/assets/js/theme.min.js
@@ -1,3 +1,3 @@
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c={type:"set-theme",theme:a.isDark?b.darkTheme:b.lightTheme},d=document.querySelector(".utterances-frame");d.contentWindow.postMessage(c,"https://utteranc.es")},this.switchThemeEventSet.add(this._utterancesOnSwitchTheme)}}}},{key:"initCookieconsent",value:function initCookieconsent(){this.config.cookieconsent&&cookieconsent.initialise(this.config.cookieconsent)}},{key:"onScroll",value:function onScroll(){var a=this,b=[];if("auto"===document.body.getAttribute("header-desktop")&&b.push(document.getElementById("header-desktop")),"auto"===document.body.getAttribute("header-mobile")&&b.push(document.getElementById("header-mobile")),document.getElementById("comments")){var e=document.getElementById("view-comments");e.href="#comments",e.style.display="block"}var c=document.getElementById("fixed-buttons"),d=20;window.addEventListener("scroll",function(){a.newScrollTop=a.util.getScrollTop();var e=a.newScrollTop-a.oldScrollTop,f=a.util.isMobile();a.util.forEach(b,function(b){e>d?(b.classList.remove("fadeInDown"),a.util.animateCSS(b,["fadeOutUp","faster"],!0)):e<-d&&(b.classList.remove("fadeOutUp"),a.util.animateCSS(b,["fadeInDown","faster"],!0))}),a.newScrollTop>100?f&&e>d?(c.classList.remove("fadeIn"),a.util.animateCSS(c,["fadeOut","faster"],!0)):(!f||e<-d)&&(c.style.display="block",c.classList.remove("fadeOut"),a.util.animateCSS(c,["fadeIn","faster"],!0)):(!f&&(c.classList.remove("fadeIn"),a.util.animateCSS(c,["fadeOut","faster"],!0)),c.style.display="none");var g,h=_createForOfIteratorHelper(a.scrollEventSet);try{for(h.s();!(g=h.n()).done;){var i=g.value;i()}}catch(a){h.e(a)}finally{h.f()}a.oldScrollTop=a.newScrollTop},!1)}},{key:"onResize",value:function onResize(){var a=this;window.addEventListener("resize",function(){a._resizeTimeout||(a._resizeTimeout=window.setTimeout(function(){a._resizeTimeout=null;var b,c=_createForOfIteratorHelper(a.resizeEventSet);try{for(c.s();!(b=c.n()).done;){var d=b.value;d()}}catch(a){c.e(a)}finally{c.f()}a.initToc(),a.initMermaid(),a.initSearch()},100))},!1)}},{key:"onClickMask",value:function onClickMask(){var a=this;document.getElementById("mask").addEventListener("click",function(){var b,c=_createForOfIteratorHelper(a.clickMaskEventSet);try{for(c.s();!(b=c.n()).done;){var d=b.value;d()}}catch(a){c.e(a)}finally{c.f()}document.body.classList.remove("blur")},!1)}},{key:"init",value:function init(){var a=this;try{this.initSVGIcon(),this.initTwemoji(),this.initMenuMobile(),this.initSwitchTheme(),this.initSearch(),this.initDetails(),this.initLightGallery(),this.initHighlight(),this.initTable(),this.initHeaderLink(),this.initMath(),this.initMermaid(),this.initEcharts(),this.initTypeit(),this.initMapbox(),this.initCookieconsent()}catch(a){console.error(a)}window.setTimeout(function(){a.initToc(),a.initComment(),a.onScroll(),a.onResize(),a.onClickMask()},100)}}]),a}(),themeInit=function(){var a=new Theme;a.init()};"loading"===document.readyState?document.addEventListener("DOMContentLoaded",themeInit,!1):themeInit();
+"use strict";function _objectDestructuringEmpty(a){if(null==a)throw new TypeError("Cannot destructure undefined")}function _createForOfIteratorHelper(a,b){var c="undefined"!=typeof Symbol&&a[Symbol.iterator]||a["@@iterator"];if(!c){if(Array.isArray(a)||(c=_unsupportedIterableToArray(a))||b&&a&&"number"==typeof a.length){c&&(a=c);var d=0,e=function(){};return{s:e,n:function n(){return d>=a.length?{done:!0}:{done:!1,value:a[d++]}},e:function e(a){throw a},f:e}}throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}var f,g=!0,h=!1;return{s:function s(){c=c.call(a)},n:function n(){var a=c.next();return g=a.done,a},e:function e(a){h=!0,f=a},f:function f(){try{g||null==c.return||c.return()}finally{if(h)throw f}}}}function _toConsumableArray(a){return _arrayWithoutHoles(a)||_iterableToArray(a)||_unsupportedIterableToArray(a)||_nonIterableSpread()}function _nonIterableSpread(){throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}function _unsupportedIterableToArray(a,b){if(a){if("string"==typeof a)return _arrayLikeToArray(a,b);var c=Object.prototype.toString.call(a).slice(8,-1);return"Object"===c&&a.constructor&&(c=a.constructor.name),"Map"===c||"Set"===c?Array.from(a):"Arguments"===c||/^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(c)?_arrayLikeToArray(a,b):void 0}}function _iterableToArray(a){if("undefined"!=typeof Symbol&&null!=a[Symbol.iterator]||null!=a["@@iterator"])return Array.from(a)}function _arrayWithoutHoles(a){if(Array.isArray(a))return _arrayLikeToArray(a)}function _arrayLikeToArray(a,b){(null==b||b>a.length)&&(b=a.length);for(var c=0,d=Array(b);c<b;c++)d[c]=a[c];return d}function _classCallCheck(a,b){if(!(a instanceof b))throw new TypeError("Cannot call a class as a function")}function _defineProperties(a,b){for(var c,d=0;d<b.length;d++)c=b[d],c.enumerable=c.enumerable||!1,c.configurable=!0,"value"in c&&(c.writable=!0),Object.defineProperty(a,c.key,c)}function _createClass(a,b,c){return b&&_defineProperties(a.prototype,b),c&&_defineProperties(a,c),Object.defineProperty(a,"prototype",{writable:!1}),a}var Util=function(){function a(){_classCallCheck(this,a)}return _createClass(a,[{key:"forEach",value:function forEach(a,b){a=a||[];for(var c=0;c<a.length;c++)b(a[c])}},{key:"getScrollTop",value:function getScrollTop(){return document.documentElement&&document.documentElement.scrollTop||document.body.scrollTop}},{key:"isMobile",value:function isMobile(){return window.matchMedia("only screen and (max-width: 680px)").matches}},{key:"isTocStatic",value:function isTocStatic(){return window.matchMedia("only screen and (max-width: 960px)").matches}},{key:"animateCSS",value:function animateCSS(a,b,c,d){var e;Array.isArray(b)||(b=[b]),(e=a.classList).add.apply(e,["animated"].concat(_toConsumableArray(b)));var f=function(){var c;(c=a.classList).remove.apply(c,["animated"].concat(_toConsumableArray(b))),a.removeEventListener("animationend",f),"function"==typeof d&&d()};c||a.addEventListener("animationend",f,!1)}}]),a}(),Theme=function(){function a(){_classCallCheck(this,a),this.config=window.config,this.data=this.config.data,this.isDark="dark"===document.body.getAttribute("theme"),this.util=new Util,this.newScrollTop=this.util.getScrollTop(),this.oldScrollTop=this.newScrollTop,this.scrollEventSet=new Set,this.resizeEventSet=new Set,this.switchThemeEventSet=new Set,this.clickMaskEventSet=new Set,window.objectFitImages&&objectFitImages()}return _createClass(a,[{key:"initSVGIcon",value:function initSVGIcon(){this.util.forEach(document.querySelectorAll("[data-svg-src]"),function(a){fetch(a.getAttribute("data-svg-src")).then(function(a){return a.text()}).then(function(b){var c=document.createElement("div");c.insertAdjacentHTML("afterbegin",b);var d=c.firstChild;d.setAttribute("data-svg-src",a.getAttribute("data-svg-src")),d.classList.add("icon");var e=d.getElementsByTagName("title");e.length&&d.removeChild(e[0]),a.parentElement.replaceChild(d,a)}).catch(function(a){console.error(a)})})}},{key:"initTwemoji",value:function initTwemoji(){this.config.twemoji&&twemoji.parse(document.body)}},{key:"initMenuMobile",value:function initMenuMobile(){var a=document.getElementById("menu-toggle-mobile"),b=document.getElementById("menu-mobile");a.addEventListener("click",function(){document.body.classList.toggle("blur"),a.classList.toggle("active"),b.classList.toggle("active")},!1),this._menuMobileOnClickMask=this._menuMobileOnClickMask||function(){a.classList.remove("active"),b.classList.remove("active")},this.clickMaskEventSet.add(this._menuMobileOnClickMask)}},{key:"initSwitchTheme",value:function initSwitchTheme(){var a=this;this.util.forEach(document.getElementsByClassName("theme-switch"),function(b){b.addEventListener("click",function(){"dark"===document.body.getAttribute("theme")?document.body.setAttribute("theme","light"):document.body.setAttribute("theme","dark"),a.isDark=!a.isDark,window.localStorage&&localStorage.setItem("theme",a.isDark?"dark":"light");var b,c=_createForOfIteratorHelper(a.switchThemeEventSet);try{for(c.s();!(b=c.n()).done;){var d=b.value;d()}}catch(a){c.e(a)}finally{c.f()}},!1)})}},{key:"initSearch",value:function initSearch(){var a=this,b=this.config.search,c=this.util.isMobile();if(!(!b||c&&this._searchMobileOnce||!c&&this._searchDesktopOnce)){var d=b.maxResultLength?b.maxResultLength:10,e=b.snippetLength?b.snippetLength:50,f=b.highlightTag?b.highlightTag:"em",g=c?"mobile":"desktop",h=document.getElementById("header-".concat(g)),i=document.getElementById("search-input-".concat(g)),j=document.getElementById("search-toggle-".concat(g)),k=document.getElementById("search-loading-".concat(g)),l=document.getElementById("search-clear-".concat(g));c?(this._searchMobileOnce=!0,i.addEventListener("focus",function(){document.body.classList.add("blur"),h.classList.add("open")},!1),document.getElementById("search-cancel-mobile").addEventListener("click",function(){h.classList.remove("open"),document.body.classList.remove("blur"),document.getElementById("menu-toggle-mobile").classList.remove("active"),document.getElementById("menu-mobile").classList.remove("active"),k.style.display="none",l.style.display="none",a._searchMobile&&a._searchMobile.autocomplete.setVal("")},!1),l.addEventListener("click",function(){l.style.display="none",a._searchMobile&&a._searchMobile.autocomplete.setVal("")},!1),this._searchMobileOnClickMask=this._searchMobileOnClickMask||function(){h.classList.remove("open"),k.style.display="none",l.style.display="none",a._searchMobile&&a._searchMobile.autocomplete.setVal("")},this.clickMaskEventSet.add(this._searchMobileOnClickMask)):(this._searchDesktopOnce=!0,j.addEventListener("click",function(){document.body.classList.add("blur"),h.classList.add("open"),i.focus()},!1),l.addEventListener("click",function(){l.style.display="none",a._searchDesktop&&a._searchDesktop.autocomplete.setVal("")},!1),this._searchDesktopOnClickMask=this._searchDesktopOnClickMask||function(){h.classList.remove("open"),k.style.display="none",l.style.display="none",a._searchDesktop&&a._searchDesktop.autocomplete.setVal("")},this.clickMaskEventSet.add(this._searchDesktopOnClickMask)),i.addEventListener("input",function(){l.style.display=""===i.value?"none":"inline"},!1);var m=function(){var h=autocomplete("#search-input-".concat(g),{hint:!1,autoselect:!0,dropdownMenuContainer:"#search-dropdown-".concat(g),clearOnSelected:!0,cssClasses:{noPrefix:!0},debug:!0},{name:"search",source:function source(c,g){k.style.display="inline",l.style.display="none";var h=function(a){k.style.display="none",l.style.display="inline",g(a)};if("lunr"===b.type){var i=function(){lunr.queryHandler&&(c=lunr.queryHandler(c));var b={};return a._index.search(c).forEach(function(c){var d=c.ref,g=c.matchData.metadata,h=a._indexData[d],i=h.uri,j=h.title,k=h.content;if(!b[i]){var l=0;Object.values(g).forEach(function(a){var b=a.content;if(b){var c=b.position[0][0];(c<l||0===l)&&(l=c)}}),l-=e/5,0<l?(l+=k.substr(l,20).lastIndexOf(" ")+1,k="..."+k.substr(l,e)):k=k.substr(0,e),Object.keys(g).forEach(function(a){j=j.replace(new RegExp("(".concat(a,")"),"gi"),"<".concat(f,">$1</").concat(f,">")),k=k.replace(new RegExp("(".concat(a,")"),"gi"),"<".concat(f,">$1</").concat(f,">"))}),b[i]={uri:i,title:j,date:h.date,context:k}}}),Object.values(b).slice(0,d)};a._index?h(i()):fetch(b.lunrIndexURL).then(function(a){return a.json()}).then(function(c){var d={};a._index=lunr(function(){var a=this;b.lunrLanguageCode&&this.use(lunr[b.lunrLanguageCode]),this.ref("objectID"),this.field("title",{boost:50}),this.field("tags",{boost:20}),this.field("categories",{boost:20}),this.field("content",{boost:10}),this.metadataWhitelist=["position"],c.forEach(function(b){d[b.objectID]=b,a.add(b)})}),a._indexData=d,h(i())}).catch(function(a){console.error(a),h([])})}else"algolia"===b.type&&(a._algoliaIndex=a._algoliaIndex||algoliasearch(b.algoliaAppID,b.algoliaSearchKey).initIndex(b.algoliaIndex),a._algoliaIndex.search(c,{offset:0,length:8*d,attributesToHighlight:["title"],attributesToSnippet:["content:".concat(e)],highlightPreTag:"<".concat(f,">"),highlightPostTag:"</".concat(f,">")}).then(function(a){var b=a.hits,c={};b.forEach(function(a){var b=a.uri,d=a.date,e=a._highlightResult.title,f=a._snippetResult.content;c[b]&&c[b].context.length>f.value||(c[b]={uri:b,title:e.value,date:d,context:f.value})}),h(Object.values(c).slice(0,d))}).catch(function(a){console.error(a),h([])}))},templates:{suggestion:function suggestion(a){var b=a.title,c=a.date,d=a.context;return"<div><span class=\"suggestion-title\">".concat(b,"</span><span class=\"suggestion-date\">").concat(c,"</span></div><div class=\"suggestion-context\">").concat(d,"</div>")},empty:function empty(a){var c=a.query;return"<div class=\"search-empty\">".concat(b.noResultsFound,": <span class=\"search-query\">\"").concat(c,"\"</span></div>")},footer:function footer(a){_objectDestructuringEmpty(a);var c="algolia"===b.type?{searchType:"algolia",icon:"<i class=\"fab fa-algolia fa-fw\"></i>",href:"https://www.algolia.com/"}:{searchType:"Lunr.js",icon:"",href:"https://lunrjs.com/"},d=c.searchType,e=c.icon,f=c.href;return"<div class=\"search-footer\">Search by <a href=\"".concat(f,"\" rel=\"noopener noreffer\" target=\"_blank\">").concat(e," ").concat(d,"</a></div>")}}});h.on("autocomplete:selected",function(a,b){window.location.assign(b.uri)}),c?a._searchMobile=h:a._searchDesktop=h};if(b.lunrSegmentitURL&&!document.getElementById("lunr-segmentit")){var n=document.createElement("script");n.id="lunr-segmentit",n.type="text/javascript",n.src=b.lunrSegmentitURL,n.async=!0,n.readyState?n.onreadystatechange=function(){("loaded"==n.readyState||"complete"==n.readyState)&&(n.onreadystatechange=null,m())}:n.onload=function(){m()},document.body.appendChild(n)}else m()}}},{key:"initDetails",value:function initDetails(){this.util.forEach(document.getElementsByClassName("details"),function(a){var b=a.getElementsByClassName("details-summary")[0];b.addEventListener("click",function(){a.classList.toggle("open")},!1)})}},{key:"initLightGallery",value:function initLightGallery(){this.config.lightGallery&&lightGallery(document.getElementById("content"),this.config.lightGallery)}},{key:"initHighlight",value:function initHighlight(){var a=this;this.util.forEach(document.querySelectorAll(".highlight > pre.chroma"),function(a){var b=document.createElement("div");b.className=a.className;var c=document.createElement("table");b.appendChild(c);var d=document.createElement("tbody");c.appendChild(d);var e=document.createElement("tr");d.appendChild(e);var f=document.createElement("td");e.appendChild(f),a.parentElement.replaceChild(b,a),f.appendChild(a)}),this.util.forEach(document.querySelectorAll(".highlight > .chroma"),function(b){var c=b.querySelectorAll("pre.chroma > code");if(c.length){var d=c[c.length-1],e=document.createElement("div");e.className="code-header "+d.className.toLowerCase();var f=document.createElement("span");f.classList.add("code-title"),f.insertAdjacentHTML("afterbegin","<i class=\"arrow fas fa-chevron-right fa-fw\"></i>"),f.addEventListener("click",function(){b.classList.toggle("open")},!1),e.appendChild(f);var g=document.createElement("span");g.insertAdjacentHTML("afterbegin","<i class=\"fas fa-ellipsis-h fa-fw\"></i>"),g.classList.add("ellipses"),g.addEventListener("click",function(){b.classList.add("open")},!1),e.appendChild(g);var h=document.createElement("span");h.insertAdjacentHTML("afterbegin","<i class=\"far fa-copy fa-fw\"></i>"),h.classList.add("copy");var i=d.innerText;if((0>a.config.code.maxShownLines||i.split("\n").length<a.config.code.maxShownLines+2)&&b.classList.add("open"),a.config.code.copyTitle){h.setAttribute("data-clipboard-text",i),h.title=a.config.code.copyTitle;var j=new ClipboardJS(h);j.on("success",function(){a.util.animateCSS(d,"flash")}),e.appendChild(h)}b.insertBefore(e,b.firstChild)}})}},{key:"initTable",value:function initTable(){this.util.forEach(document.querySelectorAll(".content table"),function(a){var b=document.createElement("div");b.className="table-wrapper",a.parentElement.replaceChild(b,a),b.appendChild(a)})}},{key:"initHeaderLink",value:function initHeaderLink(){for(var a=1;6>=a;a++)this.util.forEach(document.querySelectorAll(".single .content > h"+a),function(a){a.classList.add("headerLink"),a.insertAdjacentHTML("afterbegin","<a href=\"#".concat(a.id,"\" class=\"header-mark\"></a>"))})}},{key:"initToc",value:function initToc(){var a=this,b=document.getElementById("TableOfContents");if(null!==b)if(document.getElementById("toc-static").getAttribute("kept")||this.util.isTocStatic()){var o=document.getElementById("toc-content-static");b.parentElement!==o&&(b.parentElement.removeChild(b),o.appendChild(b)),this._tocOnScroll&&this.scrollEventSet.delete(this._tocOnScroll)}else{var p=document.getElementById("toc-content-auto");b.parentElement!==p&&(b.parentElement.removeChild(b),p.appendChild(b));var c=document.getElementById("toc-auto"),d=document.getElementsByClassName("page")[0],e=d.getBoundingClientRect();c.style.left="".concat(e.left+e.width+20,"px"),c.style.maxWidth="".concat(d.getBoundingClientRect().left-20,"px"),c.style.visibility="visible";var f=b.querySelectorAll("a:first-child"),g=b.getElementsByTagName("li"),h=document.getElementsByClassName("headerLink"),j="normal"!==document.body.getAttribute("header-desktop"),k=document.getElementById("header-desktop").offsetHeight,l=20+(j?k:0),m=c.offsetTop,n=m-l+(j?0:k);this._tocOnScroll=this._tocOnScroll||function(){var d=document.getElementById("post-footer").offsetTop,e=d-c.getBoundingClientRect().height,o=e-l+(j?0:k);a.newScrollTop<n?(c.style.position="absolute",c.style.top="".concat(m,"px")):a.newScrollTop>o?(c.style.position="absolute",c.style.top="".concat(e,"px")):(c.style.position="fixed",c.style.top="".concat(l,"px")),a.util.forEach(f,function(a){a.classList.remove("active")}),a.util.forEach(g,function(a){a.classList.remove("has-active")});for(var p=20+(j?k:0),q=h.length-1,r=0;r<h.length-1;r++){var s=h[r].getBoundingClientRect().top,t=h[r+1].getBoundingClientRect().top;if(0==r&&s>p||s<=p&&t>p){q=r;break}}if(-1!==q){f[q].classList.add("active");for(var u=f[q].parentElement;u!==b;)u.classList.add("has-active"),u=u.parentElement.parentElement}},this._tocOnScroll(),this.scrollEventSet.add(this._tocOnScroll)}}},{key:"initMath",value:function initMath(){this.config.math&&renderMathInElement(document.body,this.config.math)}},{key:"initMermaid",value:function initMermaid(){var a=this,b=document.getElementsByClassName("mermaid");b.length&&(mermaid.initialize({startOnLoad:!1,theme:"null"}),this.util.forEach(b,function(b){mermaid.mermaidAPI.render("svg-"+b.id,a.data[b.id],function(a){b.insertAdjacentHTML("afterbegin",a)},b)}))}},{key:"initEcharts",value:function initEcharts(){var a=this;this._echartsOnSwitchTheme=this._echartsOnSwitchTheme||function(){a._echartsArr=a._echartsArr||[];for(var b=0;b<a._echartsArr.length;b++)a._echartsArr[b].dispose();a._echartsArr=[],a.util.forEach(document.getElementsByClassName("echarts"),function(b){var c=echarts.init(b,a.isDark?"dark":"macarons",{renderer:"svg"});c.setOption(JSON.parse(a.data[b.id])),a._echartsArr.push(c)})},this.switchThemeEventSet.add(this._echartsOnSwitchTheme),this._echartsOnSwitchTheme(),this._echartsOnResize=this._echartsOnResize||function(){for(var b=0;b<a._echartsArr.length;b++)a._echartsArr[b].resize()},this.resizeEventSet.add(this._echartsOnResize)}},{key:"initMapbox",value:function initMapbox(){var a=this;this.config.mapbox&&(mapboxgl.accessToken=this.config.mapbox.accessToken,mapboxgl.setRTLTextPlugin(this.config.mapbox.RTLTextPlugin),this._mapboxArr=this._mapboxArr||[],this.util.forEach(document.getElementsByClassName("mapbox"),function(b){var c=a.data[b.id],d=c.lng,e=c.lat,f=c.zoom,g=c.lightStyle,h=c.darkStyle,i=c.marked,j=c.navigation,k=c.geolocate,l=c.scale,m=c.fullscreen,n=new mapboxgl.Map({container:b,center:[d,e],zoom:f,minZoom:.2,style:a.isDark?h:g,attributionControl:!1});i&&new mapboxgl.Marker().setLngLat([d,e]).addTo(n),j&&n.addControl(new mapboxgl.NavigationControl,"bottom-right"),k&&n.addControl(new mapboxgl.GeolocateControl({positionOptions:{enableHighAccuracy:!0},showUserLocation:!0,trackUserLocation:!0}),"bottom-right"),l&&n.addControl(new mapboxgl.ScaleControl),m&&n.addControl(new mapboxgl.FullscreenControl),n.addControl(new MapboxLanguage),a._mapboxArr.push(n)}),this._mapboxOnSwitchTheme=this._mapboxOnSwitchTheme||function(){a.util.forEach(a._mapboxArr,function(b){var c=b.getContainer(),d=a.data[c.id],e=d.lightStyle,f=d.darkStyle;b.setStyle(a.isDark?f:e),b.addControl(new MapboxLanguage)})},this.switchThemeEventSet.add(this._mapboxOnSwitchTheme))}},{key:"initTypeit",value:function initTypeit(){var a=this;if(this.config.typeit){var b=this.config.typeit,c=b.speed?b.speed:100,d=b.cursorSpeed?b.cursorSpeed:1e3,e=b.cursorChar?b.cursorChar:"|";Object.values(b.data).forEach(function(f){var g=function(h){var i=f[h],j=new TypeIt("#".concat(i),{strings:a.data[i],speed:c,lifeLike:!0,cursorSpeed:d,cursorChar:e,waitUntilVisible:!0,afterComplete:function afterComplete(){return h===f.length-1?void(0<=b.duration&&window.setTimeout(function(){j.destroy()},b.duration)):void(j.destroy(),g(h+1))}}).go()};g(0)})}}},{key:"initComment",value:function initComment(){var a=this;if(this.config.comment){if(this.config.comment.gitalk){this.config.comment.gitalk.body=decodeURI(window.location.href);var d=new Gitalk(this.config.comment.gitalk);d.render("gitalk")}if(this.config.comment.valine&&new Valine(this.config.comment.valine),this.config.comment.utterances){var b=this.config.comment.utterances,c=document.createElement("script");c.src="https://utteranc.es/client.js",c.type="text/javascript",c.setAttribute("repo",b.repo),c.setAttribute("issue-term",b.issueTerm),b.label&&c.setAttribute("label",b.label),c.setAttribute("theme",this.isDark?b.darkTheme:b.lightTheme),c.crossOrigin="anonymous",c.async=!0,document.getElementById("utterances").appendChild(c),this._utterancesOnSwitchTheme=this._utterancesOnSwitchTheme||function(){var c={type:"set-theme",theme:a.isDark?b.darkTheme:b.lightTheme},d=document.querySelector(".utterances-frame");d.contentWindow.postMessage(c,"https://utteranc.es")},this.switchThemeEventSet.add(this._utterancesOnSwitchTheme)}}}},{key:"initCookieconsent",value:function initCookieconsent(){this.config.cookieconsent&&cookieconsent.initialise(this.config.cookieconsent)}},{key:"onScroll",value:function onScroll(){var a=this,b=[];if("auto"===document.body.getAttribute("header-desktop")&&b.push(document.getElementById("header-desktop")),"auto"===document.body.getAttribute("header-mobile")&&b.push(document.getElementById("header-mobile")),document.getElementById("comments")){var e=document.getElementById("view-comments");e.href="#comments",e.style.display="block"}var c=document.getElementById("fixed-buttons"),d=20;window.addEventListener("scroll",function(){a.newScrollTop=a.util.getScrollTop();var 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diff --git a/assets/js/theme.min.js.map b/assets/js/theme.min.js.map
index 3f4ea15f..08b52ec5 100644
--- a/assets/js/theme.min.js.map
+++ b/assets/js/theme.min.js.map
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Util {\r\n    forEach(elements, handler) {\r\n        elements = elements || [];\r\n        for (let i = 0; i < elements.length; i++) handler(elements[i]);\r\n    }\r\n\r\n    getScrollTop() {\r\n        return (document.documentElement && document.documentElement.scrollTop) || document.body.scrollTop;\r\n    }\r\n\r\n    isMobile() {\r\n        return window.matchMedia('only screen and (max-width: 680px)').matches;\r\n    }\r\n\r\n    isTocStatic() {\r\n        return window.matchMedia('only screen and (max-width: 960px)').matches;\r\n    }\r\n\r\n    animateCSS(element, animation, reserved, callback) {\r\n        if (!Array.isArray(animation)) animation = [animation];\r\n        element.classList.add('animated', ...animation);\r\n        const handler = () => {\r\n            element.classList.remove('animated', ...animation);\r\n            element.removeEventListener('animationend', handler);\r\n            if (typeof callback === 'function') callback();\r\n        };\r\n        if (!reserved) element.addEventListener('animationend', handler, false);\r\n    }\r\n}\r\n\r\nclass Theme {\r\n    constructor() {\r\n        this.config = window.config;\r\n        this.data = this.config.data;\r\n        this.isDark = document.body.getAttribute('theme') === 'dark';\r\n        this.util = new Util();\r\n        this.newScrollTop = this.util.getScrollTop();\r\n        this.oldScrollTop = this.newScrollTop;\r\n        this.scrollEventSet = new Set();\r\n        this.resizeEventSet = new Set();\r\n        this.switchThemeEventSet = new Set();\r\n        this.clickMaskEventSet = new Set();\r\n        if (window.objectFitImages) objectFitImages();\r\n    }\r\n\r\n    initSVGIcon() {\r\n        this.util.forEach(document.querySelectorAll('[data-svg-src]'), $icon => {\r\n            fetch($icon.getAttribute('data-svg-src'))\r\n                .then(response => response.text())\r\n                .then(svg => {\r\n                    const $temp = document.createElement('div');\r\n                    $temp.insertAdjacentHTML('afterbegin', svg);\r\n                    const $svg = $temp.firstChild;\r\n                    $svg.setAttribute('data-svg-src', $icon.getAttribute('data-svg-src'));\r\n                    $svg.classList.add('icon');\r\n                    const $titleElements = $svg.getElementsByTagName('title');\r\n                    if ($titleElements.length) $svg.removeChild($titleElements[0]);\r\n                    $icon.parentElement.replaceChild($svg, $icon);\r\n                })\r\n                .catch(err => { console.error(err); });\r\n        });\r\n    }\r\n\r\n    initTwemoji() {\r\n        if (this.config.twemoji) twemoji.parse(document.body);\r\n    }\r\n\r\n    initMenuMobile() {\r\n        const $menuToggleMobile = document.getElementById('menu-toggle-mobile');\r\n        const $menuMobile = document.getElementById('menu-mobile');\r\n        $menuToggleMobile.addEventListener('click', () => {\r\n            document.body.classList.toggle('blur');\r\n            $menuToggleMobile.classList.toggle('active');\r\n            $menuMobile.classList.toggle('active');\r\n        }, false);\r\n        this._menuMobileOnClickMask = this._menuMobileOnClickMask || (() => {\r\n            $menuToggleMobile.classList.remove('active');\r\n            $menuMobile.classList.remove('active');\r\n        });\r\n        this.clickMaskEventSet.add(this._menuMobileOnClickMask);\r\n    }\r\n\r\n    initSwitchTheme() {\r\n        this.util.forEach(document.getElementsByClassName('theme-switch'), $themeSwitch => {\r\n            $themeSwitch.addEventListener('click', () => {\r\n                if (document.body.getAttribute('theme') === 'dark') document.body.setAttribute('theme', 'light');\r\n                else document.body.setAttribute('theme', 'dark');\r\n                this.isDark = !this.isDark;\r\n                window.localStorage && localStorage.setItem('theme', this.isDark ? 'dark' : 'light');\r\n                for (let event of this.switchThemeEventSet) event();\r\n            }, false);\r\n        });\r\n    }\r\n\r\n    initSearch() {\r\n        const searchConfig = this.config.search;\r\n        const isMobile = this.util.isMobile();\r\n        if (!searchConfig || isMobile && this._searchMobileOnce || !isMobile && this._searchDesktopOnce) return;\r\n\r\n        const maxResultLength = searchConfig.maxResultLength ? searchConfig.maxResultLength : 10;\r\n        const snippetLength = searchConfig.snippetLength ? searchConfig.snippetLength : 50;\r\n        const highlightTag = searchConfig.highlightTag ? searchConfig.highlightTag : 'em';\r\n\r\n        const suffix = isMobile ? 'mobile' : 'desktop';\r\n        const $header = document.getElementById(`header-${suffix}`);\r\n        const $searchInput = document.getElementById(`search-input-${suffix}`);\r\n        const $searchToggle = document.getElementById(`search-toggle-${suffix}`);\r\n        const $searchLoading = document.getElementById(`search-loading-${suffix}`);\r\n        const $searchClear = document.getElementById(`search-clear-${suffix}`);\r\n        if (isMobile) {\r\n            this._searchMobileOnce = true;\r\n            $searchInput.addEventListener('focus', () => {\r\n                document.body.classList.add('blur');\r\n                $header.classList.add('open');\r\n            }, false);\r\n            document.getElementById('search-cancel-mobile').addEventListener('click', () => {\r\n                $header.classList.remove('open');\r\n                document.body.classList.remove('blur');\r\n                document.getElementById('menu-toggle-mobile').classList.remove('active');\r\n                document.getElementById('menu-mobile').classList.remove('active');\r\n                $searchLoading.style.display = 'none';\r\n                $searchClear.style.display = 'none';\r\n                this._searchMobile && this._searchMobile.autocomplete.setVal('');\r\n            }, false);\r\n            $searchClear.addEventListener('click', () => {\r\n                $searchClear.style.display = 'none';\r\n                this._searchMobile && this._searchMobile.autocomplete.setVal('');\r\n            }, false);\r\n            this._searchMobileOnClickMask = this._searchMobileOnClickMask || (() => {\r\n                $header.classList.remove('open');\r\n                $searchLoading.style.display = 'none';\r\n                $searchClear.style.display = 'none';\r\n                this._searchMobile && this._searchMobile.autocomplete.setVal('');\r\n            });\r\n            this.clickMaskEventSet.add(this._searchMobileOnClickMask);\r\n        } else {\r\n            this._searchDesktopOnce = true;\r\n            $searchToggle.addEventListener('click', () => {\r\n                document.body.classList.add('blur');\r\n                $header.classList.add('open');\r\n                $searchInput.focus();\r\n            }, false);\r\n            $searchClear.addEventListener('click', () => {\r\n                $searchClear.style.display = 'none';\r\n                this._searchDesktop && this._searchDesktop.autocomplete.setVal('');\r\n            }, false);\r\n            this._searchDesktopOnClickMask = this._searchDesktopOnClickMask || (() => {\r\n                $header.classList.remove('open');\r\n                $searchLoading.style.display = 'none';\r\n                $searchClear.style.display = 'none';\r\n                this._searchDesktop && this._searchDesktop.autocomplete.setVal('');\r\n            });\r\n            this.clickMaskEventSet.add(this._searchDesktopOnClickMask);\r\n        }\r\n        $searchInput.addEventListener('input', () => {\r\n            if ($searchInput.value === '') $searchClear.style.display = 'none';\r\n            else $searchClear.style.display = 'inline';\r\n        }, false);\r\n\r\n        const initAutosearch = () => {\r\n            const autosearch = autocomplete(`#search-input-${suffix}`, {\r\n                hint: false,\r\n                autoselect: true,\r\n                dropdownMenuContainer: `#search-dropdown-${suffix}`,\r\n                clearOnSelected: true,\r\n                cssClasses: { noPrefix: true },\r\n                debug: true,\r\n            }, {\r\n                name: 'search',\r\n                source: (query, callback) => {\r\n                    $searchLoading.style.display = 'inline';\r\n                    $searchClear.style.display = 'none';\r\n                    const finish = (results) => {\r\n                        $searchLoading.style.display = 'none';\r\n                        $searchClear.style.display = 'inline';\r\n                        callback(results);\r\n                    };\r\n                    if (searchConfig.type === 'lunr') {\r\n                        const search = () => {\r\n                            if (lunr.queryHandler) query = lunr.queryHandler(query);\r\n                            const results = {};\r\n                            this._index.search(query).forEach(({ ref, matchData: { metadata } }) => {\r\n                                const matchData = this._indexData[ref];\r\n                                let { uri, title, content: context } = matchData;\r\n                                if (results[uri]) return;\r\n                                let position = 0;\r\n                                Object.values(metadata).forEach(({ content }) => {\r\n                                    if (content) {\r\n                                        const matchPosition = content.position[0][0];\r\n                                        if (matchPosition < position || position === 0) position = matchPosition;\r\n                                    }\r\n                                });\r\n                                position -= snippetLength / 5;\r\n                                if (position > 0) {\r\n                                    position += context.substr(position, 20).lastIndexOf(' ') + 1;\r\n                                    context = '...' + context.substr(position, snippetLength);\r\n                                } else {\r\n                                    context = context.substr(0, snippetLength);\r\n                                }\r\n                                Object.keys(metadata).forEach(key => {\r\n                                    title = title.replace(new RegExp(`(${key})`, 'gi'), `<${highlightTag}>$1</${highlightTag}>`);\r\n                                    context = context.replace(new RegExp(`(${key})`, 'gi'), `<${highlightTag}>$1</${highlightTag}>`);\r\n                                });\r\n                                results[uri] = {\r\n                                    'uri': uri,\r\n                                    'title' : title,\r\n                                    'date' : matchData.date,\r\n                                    'context' : context,\r\n                                };\r\n                            });\r\n                            return Object.values(results).slice(0, maxResultLength);\r\n                        }\r\n                        if (!this._index) {\r\n                            fetch(searchConfig.lunrIndexURL)\r\n                                .then(response => response.json())\r\n                                .then(data => {\r\n                                    const indexData = {};\r\n                                    this._index = lunr(function () {\r\n                                        if (searchConfig.lunrLanguageCode) this.use(lunr[searchConfig.lunrLanguageCode]);\r\n                                        this.ref('objectID');\r\n                                        this.field('title', { boost: 50 });\r\n                                        this.field('tags', { boost: 20 });\r\n                                        this.field('categories', { boost: 20 });\r\n                                        this.field('content', { boost: 10 });\r\n                                        this.metadataWhitelist = ['position'];\r\n                                        data.forEach((record) => {\r\n                                            indexData[record.objectID] = record;\r\n                                            this.add(record);\r\n                                        });\r\n                                    });\r\n                                    this._indexData = indexData;\r\n                                    finish(search());\r\n                                }).catch(err => {\r\n                                    console.error(err);\r\n                                    finish([]);\r\n                                });\r\n                        } else finish(search());\r\n                    } else if (searchConfig.type === 'algolia') {\r\n                        this._algoliaIndex = this._algoliaIndex || algoliasearch(searchConfig.algoliaAppID, searchConfig.algoliaSearchKey).initIndex(searchConfig.algoliaIndex);\r\n                        this._algoliaIndex\r\n                            .search(query, {\r\n                                offset: 0,\r\n                                length: maxResultLength * 8,\r\n                                attributesToHighlight: ['title'],\r\n                                attributesToSnippet: [`content:${snippetLength}`],\r\n                                highlightPreTag: `<${highlightTag}>`,\r\n                                highlightPostTag: `</${highlightTag}>`,\r\n                            })\r\n                            .then(({ hits }) => {\r\n                                const results = {};\r\n                                hits.forEach(({ uri, date, _highlightResult: { title }, _snippetResult: { content } }) => {\r\n                                    if (results[uri] && results[uri].context.length > content.value) return;\r\n                                    results[uri] = {\r\n                                        uri: uri,\r\n                                        title: title.value,\r\n                                        date: date,\r\n                                        context: content.value,\r\n                                    };\r\n                                });\r\n                                finish(Object.values(results).slice(0, maxResultLength));\r\n                            })\r\n                            .catch(err => {\r\n                                console.error(err);\r\n                                finish([]);\r\n                            });\r\n                    }\r\n                },\r\n                templates: {\r\n                    suggestion: ({ title, date, context }) => `<div><span class=\"suggestion-title\">${title}</span><span class=\"suggestion-date\">${date}</span></div><div class=\"suggestion-context\">${context}</div>`,\r\n                    empty: ({ query }) => `<div class=\"search-empty\">${searchConfig.noResultsFound}: <span class=\"search-query\">\"${query}\"</span></div>`,\r\n                    footer: ({}) => {\r\n                        const { searchType, icon, href } = searchConfig.type === 'algolia' ? {\r\n                            searchType: 'algolia',\r\n                            icon: '<i class=\"fab fa-algolia fa-fw\"></i>',\r\n                            href: 'https://www.algolia.com/',\r\n                        } : {\r\n                            searchType: 'Lunr.js',\r\n                            icon: '',\r\n                            href: 'https://lunrjs.com/',\r\n                        };\r\n                        return `<div class=\"search-footer\">Search by <a href=\"${href}\" rel=\"noopener noreffer\" target=\"_blank\">${icon} ${searchType}</a></div>`;},\r\n                },\r\n            });\r\n            autosearch.on('autocomplete:selected', (_event, suggestion, _dataset, _context) => {\r\n                window.location.assign(suggestion.uri);\r\n            });\r\n            if (isMobile) this._searchMobile = autosearch;\r\n            else this._searchDesktop = autosearch;\r\n        };\r\n        if (searchConfig.lunrSegmentitURL && !document.getElementById('lunr-segmentit')) {\r\n            const script = document.createElement('script');\r\n            script.id = 'lunr-segmentit';\r\n            script.type = 'text/javascript';\r\n            script.src = searchConfig.lunrSegmentitURL;\r\n            script.async = true;\r\n            if (script.readyState) {\r\n                script.onreadystatechange = () => {\r\n                    if (script.readyState == 'loaded' || script.readyState == 'complete'){\r\n                        script.onreadystatechange = null;\r\n                        initAutosearch();\r\n                    }\r\n                };\r\n            } else {\r\n                script.onload = () => {\r\n                    initAutosearch();\r\n                };\r\n            }\r\n            document.body.appendChild(script);\r\n        } else initAutosearch();\r\n    }\r\n\r\n    initDetails() {\r\n        this.util.forEach(document.getElementsByClassName('details'), $details => {\r\n            const $summary = $details.getElementsByClassName('details-summary')[0];\r\n            $summary.addEventListener('click', () => {\r\n                $details.classList.toggle('open');\r\n            }, false);\r\n        });\r\n    }\r\n\r\n    initLightGallery() {\r\n        if (this.config.lightGallery) lightGallery(document.getElementById('content'), this.config.lightGallery);\r\n    }\r\n\r\n    initHighlight() {\r\n        this.util.forEach(document.querySelectorAll('.highlight > pre.chroma'), $preChroma => {\r\n            const $chroma = document.createElement('div');\r\n            $chroma.className = $preChroma.className;\r\n            const $table = document.createElement('table');\r\n            $chroma.appendChild($table);\r\n            const $tbody = document.createElement('tbody');\r\n            $table.appendChild($tbody);\r\n            const $tr = document.createElement('tr');\r\n            $tbody.appendChild($tr);\r\n            const $td = document.createElement('td');\r\n            $tr.appendChild($td);\r\n            $preChroma.parentElement.replaceChild($chroma, $preChroma);\r\n            $td.appendChild($preChroma);\r\n        });\r\n        this.util.forEach(document.querySelectorAll('.highlight > .chroma'), $chroma => {\r\n            const $codeElements = $chroma.querySelectorAll('pre.chroma > code');\r\n            if ($codeElements.length) {\r\n                const $code = $codeElements[$codeElements.length - 1];\r\n                const $header = document.createElement('div');\r\n                $header.className = 'code-header ' + $code.className.toLowerCase();\r\n                const $title = document.createElement('span');\r\n                $title.classList.add('code-title');\r\n                $title.insertAdjacentHTML('afterbegin', '<i class=\"arrow fas fa-chevron-right fa-fw\"></i>');\r\n                $title.addEventListener('click', () => {\r\n                    $chroma.classList.toggle('open');\r\n                }, false);\r\n                $header.appendChild($title);\r\n                const $ellipses = document.createElement('span');\r\n                $ellipses.insertAdjacentHTML('afterbegin', '<i class=\"fas fa-ellipsis-h fa-fw\"></i>');\r\n                $ellipses.classList.add('ellipses');\r\n                $ellipses.addEventListener('click', () => {\r\n                    $chroma.classList.add('open');\r\n                }, false);\r\n                $header.appendChild($ellipses);\r\n                const $copy = document.createElement('span');\r\n                $copy.insertAdjacentHTML('afterbegin', '<i class=\"far fa-copy fa-fw\"></i>');\r\n                $copy.classList.add('copy');\r\n                const code = $code.innerText;\r\n                if (this.config.code.maxShownLines < 0 || code.split('\\n').length < this.config.code.maxShownLines + 2) $chroma.classList.add('open');\r\n                if (this.config.code.copyTitle) {\r\n                    $copy.setAttribute('data-clipboard-text', code);\r\n                    $copy.title = this.config.code.copyTitle;\r\n                    const clipboard = new ClipboardJS($copy);\r\n                    clipboard.on('success', _e => {\r\n                        this.util.animateCSS($code, 'flash');\r\n                    });\r\n                    $header.appendChild($copy);\r\n                }\r\n                $chroma.insertBefore($header, $chroma.firstChild);\r\n            }\r\n        });\r\n    }\r\n\r\n    initTable() {\r\n        this.util.forEach(document.querySelectorAll('.content table'), $table => {\r\n            const $wrapper = document.createElement('div');\r\n            $wrapper.className = 'table-wrapper';\r\n            $table.parentElement.replaceChild($wrapper, $table);\r\n            $wrapper.appendChild($table);\r\n        });\r\n    }\r\n\r\n    initHeaderLink() {\r\n        for (let num = 1; num <= 6; num++) {\r\n            this.util.forEach(document.querySelectorAll('.single .content > h' + num), $header => {\r\n                $header.classList.add('headerLink');\r\n                $header.insertAdjacentHTML('afterbegin', `<a href=\"#${$header.id}\" class=\"header-mark\"></a>`);\r\n            });\r\n        }\r\n    }\r\n\r\n    initToc() {\r\n        const $tocCore = document.getElementById('TableOfContents');\r\n        if ($tocCore === null) return;\r\n        if (document.getElementById('toc-static').getAttribute('kept') || this.util.isTocStatic()) {\r\n            const $tocContentStatic = document.getElementById('toc-content-static');\r\n            if ($tocCore.parentElement !== $tocContentStatic) {\r\n                $tocCore.parentElement.removeChild($tocCore);\r\n                $tocContentStatic.appendChild($tocCore);\r\n            }\r\n            if (this._tocOnScroll) this.scrollEventSet.delete(this._tocOnScroll);\r\n        } else {\r\n            const $tocContentAuto = document.getElementById('toc-content-auto');\r\n            if ($tocCore.parentElement !== $tocContentAuto) {\r\n                $tocCore.parentElement.removeChild($tocCore);\r\n                $tocContentAuto.appendChild($tocCore);\r\n            }\r\n            const $toc = document.getElementById('toc-auto');\r\n            const $page = document.getElementsByClassName('page')[0];\r\n            const rect = $page.getBoundingClientRect();\r\n            $toc.style.left = `${rect.left + rect.width + 20}px`;\r\n            $toc.style.maxWidth = `${$page.getBoundingClientRect().left - 20}px`;\r\n            $toc.style.visibility = 'visible';\r\n            const $tocLinkElements = $tocCore.querySelectorAll('a:first-child');\r\n            const $tocLiElements = $tocCore.getElementsByTagName('li');\r\n            const $headerLinkElements = document.getElementsByClassName('headerLink');\r\n            const headerIsFixed = document.body.getAttribute('header-desktop') !== 'normal';\r\n            const headerHeight = document.getElementById('header-desktop').offsetHeight;\r\n            const TOP_SPACING = 20 + (headerIsFixed ? headerHeight : 0);\r\n            const minTocTop = $toc.offsetTop;\r\n            const minScrollTop = minTocTop - TOP_SPACING + (headerIsFixed ? 0 : headerHeight);\r\n            this._tocOnScroll = this._tocOnScroll || (() => {\r\n                const footerTop = document.getElementById('post-footer').offsetTop;\r\n                const maxTocTop = footerTop - $toc.getBoundingClientRect().height;\r\n                const maxScrollTop = maxTocTop - TOP_SPACING + (headerIsFixed ? 0 : headerHeight);\r\n                if (this.newScrollTop < minScrollTop) {\r\n                    $toc.style.position = 'absolute';\r\n                    $toc.style.top = `${minTocTop}px`;\r\n                } else if (this.newScrollTop > maxScrollTop) {\r\n                    $toc.style.position = 'absolute';\r\n                    $toc.style.top = `${maxTocTop}px`;\r\n                } else {\r\n                    $toc.style.position = 'fixed';\r\n                    $toc.style.top = `${TOP_SPACING}px`;\r\n                }\r\n\r\n                this.util.forEach($tocLinkElements, $tocLink => { $tocLink.classList.remove('active'); });\r\n                this.util.forEach($tocLiElements, $tocLi => { $tocLi.classList.remove('has-active'); });\r\n                const INDEX_SPACING = 20 + (headerIsFixed ? headerHeight : 0);\r\n                let activeTocIndex = $headerLinkElements.length - 1;\r\n                for (let i = 0; i < $headerLinkElements.length - 1; i++) {\r\n                    const thisTop = $headerLinkElements[i].getBoundingClientRect().top;\r\n                    const nextTop = $headerLinkElements[i + 1].getBoundingClientRect().top;\r\n                    if ((i == 0 && thisTop > INDEX_SPACING)\r\n                     || (thisTop <= INDEX_SPACING && nextTop > INDEX_SPACING)) {\r\n                        activeTocIndex = i;\r\n                        break;\r\n                    }\r\n                }\r\n                if (activeTocIndex !== -1) {\r\n                    $tocLinkElements[activeTocIndex].classList.add('active');\r\n                    let $parent = $tocLinkElements[activeTocIndex].parentElement;\r\n                    while ($parent !== $tocCore) {\r\n                        $parent.classList.add('has-active');\r\n                        $parent = $parent.parentElement.parentElement;\r\n                    }\r\n                }\r\n            });\r\n            this._tocOnScroll();\r\n            this.scrollEventSet.add(this._tocOnScroll);\r\n        }\r\n    }\r\n\r\n    initMath() {\r\n        if (this.config.math) renderMathInElement(document.body, this.config.math);\r\n    }\r\n\r\n    initMermaid() {\r\n        const $mermaidElements = document.getElementsByClassName('mermaid');\r\n        if ($mermaidElements.length) {\r\n            mermaid.initialize({startOnLoad: false, theme: 'null'});\r\n            this.util.forEach($mermaidElements, $mermaid => {\r\n                mermaid.mermaidAPI.render('svg-' + $mermaid.id, this.data[$mermaid.id], svgCode => {\r\n                    $mermaid.insertAdjacentHTML('afterbegin', svgCode);\r\n                }, $mermaid);\r\n            });\r\n        }\r\n    }\r\n\r\n    initEcharts() {\r\n        this._echartsOnSwitchTheme = this._echartsOnSwitchTheme || (() => {\r\n            this._echartsArr = this._echartsArr || [];\r\n            for (let i = 0; i < this._echartsArr.length; i++) {\r\n                this._echartsArr[i].dispose();\r\n            }\r\n            this._echartsArr = [];\r\n            this.util.forEach(document.getElementsByClassName('echarts'), $echarts => {\r\n                const chart = echarts.init($echarts, this.isDark ? 'dark' : 'macarons', {renderer: 'svg'});\r\n                chart.setOption(JSON.parse(this.data[$echarts.id]));\r\n                this._echartsArr.push(chart);\r\n            });\r\n        });\r\n        this.switchThemeEventSet.add(this._echartsOnSwitchTheme);\r\n        this._echartsOnSwitchTheme();\r\n        this._echartsOnResize = this._echartsOnResize || (() => {\r\n            for (let i = 0; i < this._echartsArr.length; i++) {\r\n                this._echartsArr[i].resize();\r\n            }\r\n        });\r\n        this.resizeEventSet.add(this._echartsOnResize);\r\n    }\r\n\r\n    initMapbox() {\r\n        if (this.config.mapbox) {\r\n            mapboxgl.accessToken = this.config.mapbox.accessToken;\r\n            mapboxgl.setRTLTextPlugin(this.config.mapbox.RTLTextPlugin);\r\n            this._mapboxArr = this._mapboxArr || [];\r\n            this.util.forEach(document.getElementsByClassName('mapbox'), $mapbox => {\r\n                const { lng, lat, zoom, lightStyle, darkStyle, marked, navigation, geolocate, scale, fullscreen } = this.data[$mapbox.id];\r\n                const mapbox = new mapboxgl.Map({\r\n                    container: $mapbox,\r\n                    center: [lng, lat],\r\n                    zoom: zoom,\r\n                    minZoom: .2,\r\n                    style: this.isDark ? darkStyle : lightStyle,\r\n                    attributionControl: false,\r\n                });\r\n                if (marked) {\r\n                    new mapboxgl.Marker().setLngLat([lng, lat]).addTo(mapbox);\r\n                }\r\n                if (navigation) {\r\n                    mapbox.addControl(new mapboxgl.NavigationControl(), 'bottom-right');\r\n                }\r\n                if (geolocate) {\r\n                    mapbox.addControl(new mapboxgl.GeolocateControl({\r\n                        positionOptions: {\r\n                            enableHighAccuracy: true,\r\n                        },\r\n                        showUserLocation: true,\r\n                        trackUserLocation: true,\r\n                    }), 'bottom-right');\r\n                }\r\n                if (scale) {\r\n                    mapbox.addControl(new mapboxgl.ScaleControl());\r\n                }\r\n                if (fullscreen) {\r\n                    mapbox.addControl(new mapboxgl.FullscreenControl());\r\n                }\r\n                mapbox.addControl(new MapboxLanguage());\r\n                this._mapboxArr.push(mapbox);\r\n            });\r\n            this._mapboxOnSwitchTheme = this._mapboxOnSwitchTheme || (() => {\r\n                this.util.forEach(this._mapboxArr, mapbox => {\r\n                    const $mapbox = mapbox.getContainer();\r\n                    const { lightStyle, darkStyle } = this.data[$mapbox.id];\r\n                    mapbox.setStyle(this.isDark ? darkStyle : lightStyle);\r\n                    mapbox.addControl(new MapboxLanguage());\r\n                });\r\n            });\r\n            this.switchThemeEventSet.add(this._mapboxOnSwitchTheme);\r\n        }\r\n    }\r\n\r\n    initTypeit() {\r\n        if (this.config.typeit) {\r\n            const typeitConfig = this.config.typeit;\r\n            const speed = typeitConfig.speed ? typeitConfig.speed : 100;\r\n            const cursorSpeed = typeitConfig.cursorSpeed ? typeitConfig.cursorSpeed : 1000;\r\n            const cursorChar = typeitConfig.cursorChar ? typeitConfig.cursorChar : '|';\r\n            Object.values(typeitConfig.data).forEach(group => {\r\n                const typeone = (i) => {\r\n                    const id = group[i];\r\n                    const instance = new TypeIt(`#${id}`, {\r\n                        strings: this.data[id],\r\n                        speed: speed,\r\n                        lifeLike: true,\r\n                        cursorSpeed: cursorSpeed,\r\n                        cursorChar: cursorChar,\r\n                        waitUntilVisible: true,\r\n                        afterComplete: () => {\r\n                            if (i === group.length - 1) {\r\n                                if (typeitConfig.duration >= 0) window.setTimeout(() => {\r\n                                    instance.destroy();\r\n                                }, typeitConfig.duration);\r\n                                return;\r\n                            }\r\n                            instance.destroy();\r\n                            typeone(i + 1);\r\n                        },\r\n                    }).go();\r\n                };\r\n                typeone(0);\r\n            });\r\n        }\r\n    }\r\n\r\n    initComment() {\r\n        if (this.config.comment) {\r\n            if (this.config.comment.gitalk) {\r\n                this.config.comment.gitalk.body = decodeURI(window.location.href);\r\n                const gitalk = new Gitalk(this.config.comment.gitalk);\r\n                gitalk.render('gitalk');\r\n            }\r\n            if (this.config.comment.valine) new Valine(this.config.comment.valine);\r\n            if (this.config.comment.utterances) {\r\n                const utterancesConfig = this.config.comment.utterances;\r\n                const script = document.createElement('script');\r\n                script.src = 'https://utteranc.es/client.js';\r\n                script.type = 'text/javascript';\r\n                script.setAttribute('repo', utterancesConfig.repo);\r\n                script.setAttribute('issue-term', utterancesConfig.issueTerm);\r\n                if (utterancesConfig.label) script.setAttribute('label', utterancesConfig.label);\r\n                script.setAttribute('theme', this.isDark ? utterancesConfig.darkTheme : utterancesConfig.lightTheme);\r\n                script.crossOrigin = 'anonymous';\r\n                script.async = true;\r\n                document.getElementById('utterances').appendChild(script);\r\n                this._utterancesOnSwitchTheme = this._utterancesOnSwitchTheme || (() => {\r\n                    const message = {\r\n                        type: 'set-theme',\r\n                        theme: this.isDark ? utterancesConfig.darkTheme : utterancesConfig.lightTheme,\r\n                    };\r\n                    const iframe = document.querySelector('.utterances-frame');\r\n                    iframe.contentWindow.postMessage(message, 'https://utteranc.es');\r\n                });\r\n                this.switchThemeEventSet.add(this._utterancesOnSwitchTheme);\r\n            }\r\n        }\r\n    }\r\n\r\n    initCookieconsent() {\r\n        if (this.config.cookieconsent) cookieconsent.initialise(this.config.cookieconsent);\r\n    }\r\n\r\n    onScroll() {\r\n        const $headers = [];\r\n        if (document.body.getAttribute('header-desktop') === 'auto') $headers.push(document.getElementById('header-desktop'));\r\n        if (document.body.getAttribute('header-mobile') === 'auto') $headers.push(document.getElementById('header-mobile'));\r\n        if (document.getElementById('comments')) {\r\n            const $viewComments = document.getElementById('view-comments');\r\n            $viewComments.href = `#comments`;\r\n            $viewComments.style.display = 'block';\r\n        }\r\n        const $fixedButtons = document.getElementById('fixed-buttons');\r\n        const ACCURACY = 20, MINIMUM = 100;\r\n        window.addEventListener('scroll', () => {\r\n            this.newScrollTop = this.util.getScrollTop();\r\n            const scroll = this.newScrollTop - this.oldScrollTop;\r\n            const isMobile = this.util.isMobile();\r\n            this.util.forEach($headers, $header => {\r\n                if (scroll > ACCURACY) {\r\n                    $header.classList.remove('fadeInDown');\r\n                    this.util.animateCSS($header, ['fadeOutUp', 'faster'], true);\r\n                } else if (scroll < - ACCURACY) {\r\n                    $header.classList.remove('fadeOutUp');\r\n                    this.util.animateCSS($header, ['fadeInDown', 'faster'], true);\r\n                }\r\n            });\r\n            if (this.newScrollTop > MINIMUM) {\r\n                if (isMobile && scroll > ACCURACY) {\r\n                    $fixedButtons.classList.remove('fadeIn');\r\n                    this.util.animateCSS($fixedButtons, ['fadeOut', 'faster'], true);\r\n                } else if (!isMobile || scroll < - ACCURACY) {\r\n                    $fixedButtons.style.display = 'block';\r\n                    $fixedButtons.classList.remove('fadeOut');\r\n                    this.util.animateCSS($fixedButtons, ['fadeIn', 'faster'], true);\r\n                }\r\n            } else {\r\n                if (!isMobile) {\r\n                    $fixedButtons.classList.remove('fadeIn');\r\n                    this.util.animateCSS($fixedButtons, ['fadeOut', 'faster'], true);\r\n                }\r\n                $fixedButtons.style.display = 'none';\r\n            }\r\n            for (let event of this.scrollEventSet) event();\r\n            this.oldScrollTop = this.newScrollTop;\r\n        }, false);\r\n    }\r\n\r\n    onResize() {\r\n        window.addEventListener('resize', () => {\r\n            if (!this._resizeTimeout) {\r\n                this._resizeTimeout = window.setTimeout(() => {\r\n                    this._resizeTimeout = null;\r\n                    for (let event of this.resizeEventSet) event();\r\n                    this.initToc();\r\n                    this.initMermaid();\r\n                    this.initSearch();\r\n                }, 100);\r\n            }\r\n        }, false);\r\n    }\r\n\r\n    onClickMask() {\r\n        document.getElementById('mask').addEventListener('click', () => {\r\n            for (let event of this.clickMaskEventSet) event();\r\n            document.body.classList.remove('blur');\r\n        }, false);\r\n    }\r\n\r\n    init() {\r\n        try {\r\n            this.initSVGIcon();\r\n            this.initTwemoji();\r\n            this.initMenuMobile();\r\n            this.initSwitchTheme();\r\n            this.initSearch();\r\n            this.initDetails();\r\n            this.initLightGallery();\r\n            this.initHighlight();\r\n            this.initTable();\r\n            this.initHeaderLink();\r\n            this.initMath();\r\n            this.initMermaid();\r\n            this.initEcharts();\r\n            this.initTypeit();\r\n            this.initMapbox();\r\n            this.initCookieconsent();\r\n        } catch (err) {\r\n            console.error(err);\r\n        }\r\n\r\n        window.setTimeout(() => {\r\n            this.initToc();\r\n            this.initComment();\r\n\r\n            this.onScroll();\r\n            this.onResize();\r\n            this.onClickMask();\r\n        }, 100);\r\n    }\r\n}\r\n\r\nconst themeInit = () => {\r\n    const theme = new Theme();\r\n    theme.init();\r\n};\r\n\r\nif (document.readyState !== 'loading') {\r\n    themeInit();\r\n} else {\r\n    document.addEventListener('DOMContentLoaded', themeInit, false);\r\n}\r\n"]}
\ No newline at end of file
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Util {\n    forEach(elements, handler) {\n        elements = elements || [];\n        for (let i = 0; i < elements.length; i++) handler(elements[i]);\n    }\n\n    getScrollTop() {\n        return (document.documentElement && document.documentElement.scrollTop) || document.body.scrollTop;\n    }\n\n    isMobile() {\n        return window.matchMedia('only screen and (max-width: 680px)').matches;\n    }\n\n    isTocStatic() {\n        return window.matchMedia('only screen and (max-width: 960px)').matches;\n    }\n\n    animateCSS(element, animation, reserved, callback) {\n        if (!Array.isArray(animation)) animation = [animation];\n        element.classList.add('animated', ...animation);\n        const handler = () => {\n            element.classList.remove('animated', ...animation);\n            element.removeEventListener('animationend', handler);\n            if (typeof callback === 'function') callback();\n        };\n        if (!reserved) element.addEventListener('animationend', handler, false);\n    }\n}\n\nclass Theme {\n    constructor() {\n        this.config = window.config;\n        this.data = this.config.data;\n        this.isDark = document.body.getAttribute('theme') === 'dark';\n        this.util = new Util();\n        this.newScrollTop = this.util.getScrollTop();\n        this.oldScrollTop = this.newScrollTop;\n        this.scrollEventSet = new Set();\n        this.resizeEventSet = new Set();\n        this.switchThemeEventSet = new Set();\n        this.clickMaskEventSet = new Set();\n        if (window.objectFitImages) objectFitImages();\n    }\n\n    initSVGIcon() {\n        this.util.forEach(document.querySelectorAll('[data-svg-src]'), $icon => {\n            fetch($icon.getAttribute('data-svg-src'))\n                .then(response => response.text())\n                .then(svg => {\n                    const $temp = document.createElement('div');\n                    $temp.insertAdjacentHTML('afterbegin', svg);\n                    const $svg = $temp.firstChild;\n                    $svg.setAttribute('data-svg-src', $icon.getAttribute('data-svg-src'));\n                    $svg.classList.add('icon');\n                    const $titleElements = $svg.getElementsByTagName('title');\n                    if ($titleElements.length) $svg.removeChild($titleElements[0]);\n                    $icon.parentElement.replaceChild($svg, $icon);\n                })\n                .catch(err => { console.error(err); });\n        });\n    }\n\n    initTwemoji() {\n        if (this.config.twemoji) twemoji.parse(document.body);\n    }\n\n    initMenuMobile() {\n        const $menuToggleMobile = document.getElementById('menu-toggle-mobile');\n        const $menuMobile = document.getElementById('menu-mobile');\n        $menuToggleMobile.addEventListener('click', () => {\n            document.body.classList.toggle('blur');\n            $menuToggleMobile.classList.toggle('active');\n            $menuMobile.classList.toggle('active');\n        }, false);\n        this._menuMobileOnClickMask = this._menuMobileOnClickMask || (() => {\n            $menuToggleMobile.classList.remove('active');\n            $menuMobile.classList.remove('active');\n        });\n        this.clickMaskEventSet.add(this._menuMobileOnClickMask);\n    }\n\n    initSwitchTheme() {\n        this.util.forEach(document.getElementsByClassName('theme-switch'), $themeSwitch => {\n            $themeSwitch.addEventListener('click', () => {\n                if (document.body.getAttribute('theme') === 'dark') document.body.setAttribute('theme', 'light');\n                else document.body.setAttribute('theme', 'dark');\n                this.isDark = !this.isDark;\n                window.localStorage && localStorage.setItem('theme', this.isDark ? 'dark' : 'light');\n                for (let event of this.switchThemeEventSet) event();\n            }, false);\n        });\n    }\n\n    initSearch() {\n        const searchConfig = this.config.search;\n        const isMobile = this.util.isMobile();\n        if (!searchConfig || isMobile && this._searchMobileOnce || !isMobile && this._searchDesktopOnce) return;\n\n        const maxResultLength = searchConfig.maxResultLength ? searchConfig.maxResultLength : 10;\n        const snippetLength = searchConfig.snippetLength ? searchConfig.snippetLength : 50;\n        const highlightTag = searchConfig.highlightTag ? searchConfig.highlightTag : 'em';\n\n        const suffix = isMobile ? 'mobile' : 'desktop';\n        const $header = document.getElementById(`header-${suffix}`);\n        const $searchInput = document.getElementById(`search-input-${suffix}`);\n        const $searchToggle = document.getElementById(`search-toggle-${suffix}`);\n        const $searchLoading = document.getElementById(`search-loading-${suffix}`);\n        const $searchClear = document.getElementById(`search-clear-${suffix}`);\n        if (isMobile) {\n            this._searchMobileOnce = true;\n            $searchInput.addEventListener('focus', () => {\n                document.body.classList.add('blur');\n                $header.classList.add('open');\n            }, false);\n            document.getElementById('search-cancel-mobile').addEventListener('click', () => {\n                $header.classList.remove('open');\n                document.body.classList.remove('blur');\n                document.getElementById('menu-toggle-mobile').classList.remove('active');\n                document.getElementById('menu-mobile').classList.remove('active');\n                $searchLoading.style.display = 'none';\n                $searchClear.style.display = 'none';\n                this._searchMobile && this._searchMobile.autocomplete.setVal('');\n            }, false);\n            $searchClear.addEventListener('click', () => {\n                $searchClear.style.display = 'none';\n                this._searchMobile && this._searchMobile.autocomplete.setVal('');\n            }, false);\n            this._searchMobileOnClickMask = this._searchMobileOnClickMask || (() => {\n                $header.classList.remove('open');\n                $searchLoading.style.display = 'none';\n                $searchClear.style.display = 'none';\n                this._searchMobile && this._searchMobile.autocomplete.setVal('');\n            });\n            this.clickMaskEventSet.add(this._searchMobileOnClickMask);\n        } else {\n            this._searchDesktopOnce = true;\n            $searchToggle.addEventListener('click', () => {\n                document.body.classList.add('blur');\n                $header.classList.add('open');\n                $searchInput.focus();\n            }, false);\n            $searchClear.addEventListener('click', () => {\n                $searchClear.style.display = 'none';\n                this._searchDesktop && this._searchDesktop.autocomplete.setVal('');\n            }, false);\n            this._searchDesktopOnClickMask = this._searchDesktopOnClickMask || (() => {\n                $header.classList.remove('open');\n                $searchLoading.style.display = 'none';\n                $searchClear.style.display = 'none';\n                this._searchDesktop && this._searchDesktop.autocomplete.setVal('');\n            });\n            this.clickMaskEventSet.add(this._searchDesktopOnClickMask);\n        }\n        $searchInput.addEventListener('input', () => {\n            if ($searchInput.value === '') $searchClear.style.display = 'none';\n            else $searchClear.style.display = 'inline';\n        }, false);\n\n        const initAutosearch = () => {\n            const autosearch = autocomplete(`#search-input-${suffix}`, {\n                hint: false,\n                autoselect: true,\n                dropdownMenuContainer: `#search-dropdown-${suffix}`,\n                clearOnSelected: true,\n                cssClasses: { noPrefix: true },\n                debug: true,\n            }, {\n                name: 'search',\n                source: (query, callback) => {\n                    $searchLoading.style.display = 'inline';\n                    $searchClear.style.display = 'none';\n                    const finish = (results) => {\n                        $searchLoading.style.display = 'none';\n                        $searchClear.style.display = 'inline';\n                        callback(results);\n                    };\n                    if (searchConfig.type === 'lunr') {\n                        const search = () => {\n                            if (lunr.queryHandler) query = lunr.queryHandler(query);\n                            const results = {};\n                            this._index.search(query).forEach(({ ref, matchData: { metadata } }) => {\n                                const matchData = this._indexData[ref];\n                                let { uri, title, content: context } = matchData;\n                                if (results[uri]) return;\n                                let position = 0;\n                                Object.values(metadata).forEach(({ content }) => {\n                                    if (content) {\n                                        const matchPosition = content.position[0][0];\n                                        if (matchPosition < position || position === 0) position = matchPosition;\n                                    }\n                                });\n                                position -= snippetLength / 5;\n                                if (position > 0) {\n                                    position += context.substr(position, 20).lastIndexOf(' ') + 1;\n                                    context = '...' + context.substr(position, snippetLength);\n                                } else {\n                                    context = context.substr(0, snippetLength);\n                                }\n                                Object.keys(metadata).forEach(key => {\n                                    title = title.replace(new RegExp(`(${key})`, 'gi'), `<${highlightTag}>$1</${highlightTag}>`);\n                                    context = context.replace(new RegExp(`(${key})`, 'gi'), `<${highlightTag}>$1</${highlightTag}>`);\n                                });\n                                results[uri] = {\n                                    'uri': uri,\n                                    'title' : title,\n                                    'date' : matchData.date,\n                                    'context' : context,\n                                };\n                            });\n                            return Object.values(results).slice(0, maxResultLength);\n                        }\n                        if (!this._index) {\n                            fetch(searchConfig.lunrIndexURL)\n                                .then(response => response.json())\n                                .then(data => {\n                                    const indexData = {};\n                                    this._index = lunr(function () {\n                                        if (searchConfig.lunrLanguageCode) this.use(lunr[searchConfig.lunrLanguageCode]);\n                                        this.ref('objectID');\n                                        this.field('title', { boost: 50 });\n                                        this.field('tags', { boost: 20 });\n                                        this.field('categories', { boost: 20 });\n                                        this.field('content', { boost: 10 });\n                                        this.metadataWhitelist = ['position'];\n                                        data.forEach((record) => {\n                                            indexData[record.objectID] = record;\n                                            this.add(record);\n                                        });\n                                    });\n                                    this._indexData = indexData;\n                                    finish(search());\n                                }).catch(err => {\n                                    console.error(err);\n                                    finish([]);\n                                });\n                        } else finish(search());\n                    } else if (searchConfig.type === 'algolia') {\n                        this._algoliaIndex = this._algoliaIndex || algoliasearch(searchConfig.algoliaAppID, searchConfig.algoliaSearchKey).initIndex(searchConfig.algoliaIndex);\n                        this._algoliaIndex\n                            .search(query, {\n                                offset: 0,\n                                length: maxResultLength * 8,\n                                attributesToHighlight: ['title'],\n                                attributesToSnippet: [`content:${snippetLength}`],\n                                highlightPreTag: `<${highlightTag}>`,\n                                highlightPostTag: `</${highlightTag}>`,\n                            })\n                            .then(({ hits }) => {\n                                const results = {};\n                                hits.forEach(({ uri, date, _highlightResult: { title }, _snippetResult: { content } }) => {\n                                    if (results[uri] && results[uri].context.length > content.value) return;\n                                    results[uri] = {\n                                        uri: uri,\n                                        title: title.value,\n                                        date: date,\n                                        context: content.value,\n                                    };\n                                });\n                                finish(Object.values(results).slice(0, maxResultLength));\n                            })\n                            .catch(err => {\n                                console.error(err);\n                                finish([]);\n                            });\n                    }\n                },\n                templates: {\n                    suggestion: ({ title, date, context }) => `<div><span class=\"suggestion-title\">${title}</span><span class=\"suggestion-date\">${date}</span></div><div class=\"suggestion-context\">${context}</div>`,\n                    empty: ({ query }) => `<div class=\"search-empty\">${searchConfig.noResultsFound}: <span class=\"search-query\">\"${query}\"</span></div>`,\n                    footer: ({}) => {\n                        const { searchType, icon, href } = searchConfig.type === 'algolia' ? {\n                            searchType: 'algolia',\n                            icon: '<i class=\"fab fa-algolia fa-fw\"></i>',\n                            href: 'https://www.algolia.com/',\n                        } : {\n                            searchType: 'Lunr.js',\n                            icon: '',\n                            href: 'https://lunrjs.com/',\n                        };\n                        return `<div class=\"search-footer\">Search by <a href=\"${href}\" rel=\"noopener noreffer\" target=\"_blank\">${icon} ${searchType}</a></div>`;},\n                },\n            });\n            autosearch.on('autocomplete:selected', (_event, suggestion, _dataset, _context) => {\n                window.location.assign(suggestion.uri);\n            });\n            if (isMobile) this._searchMobile = autosearch;\n            else this._searchDesktop = autosearch;\n        };\n        if (searchConfig.lunrSegmentitURL && !document.getElementById('lunr-segmentit')) {\n            const script = document.createElement('script');\n            script.id = 'lunr-segmentit';\n            script.type = 'text/javascript';\n            script.src = searchConfig.lunrSegmentitURL;\n            script.async = true;\n            if (script.readyState) {\n                script.onreadystatechange = () => {\n                    if (script.readyState == 'loaded' || script.readyState == 'complete'){\n                        script.onreadystatechange = null;\n                        initAutosearch();\n                    }\n                };\n            } else {\n                script.onload = () => {\n                    initAutosearch();\n                };\n            }\n            document.body.appendChild(script);\n        } else initAutosearch();\n    }\n\n    initDetails() {\n        this.util.forEach(document.getElementsByClassName('details'), $details => {\n            const $summary = $details.getElementsByClassName('details-summary')[0];\n            $summary.addEventListener('click', () => {\n                $details.classList.toggle('open');\n            }, false);\n        });\n    }\n\n    initLightGallery() {\n        if (this.config.lightGallery) lightGallery(document.getElementById('content'), this.config.lightGallery);\n    }\n\n    initHighlight() {\n        this.util.forEach(document.querySelectorAll('.highlight > pre.chroma'), $preChroma => {\n            const $chroma = document.createElement('div');\n            $chroma.className = $preChroma.className;\n            const $table = document.createElement('table');\n            $chroma.appendChild($table);\n            const $tbody = document.createElement('tbody');\n            $table.appendChild($tbody);\n            const $tr = document.createElement('tr');\n            $tbody.appendChild($tr);\n            const $td = document.createElement('td');\n            $tr.appendChild($td);\n            $preChroma.parentElement.replaceChild($chroma, $preChroma);\n            $td.appendChild($preChroma);\n        });\n        this.util.forEach(document.querySelectorAll('.highlight > .chroma'), $chroma => {\n            const $codeElements = $chroma.querySelectorAll('pre.chroma > code');\n            if ($codeElements.length) {\n                const $code = $codeElements[$codeElements.length - 1];\n                const $header = document.createElement('div');\n                $header.className = 'code-header ' + $code.className.toLowerCase();\n                const $title = document.createElement('span');\n                $title.classList.add('code-title');\n                $title.insertAdjacentHTML('afterbegin', '<i class=\"arrow fas fa-chevron-right fa-fw\"></i>');\n                $title.addEventListener('click', () => {\n                    $chroma.classList.toggle('open');\n                }, false);\n                $header.appendChild($title);\n                const $ellipses = document.createElement('span');\n                $ellipses.insertAdjacentHTML('afterbegin', '<i class=\"fas fa-ellipsis-h fa-fw\"></i>');\n                $ellipses.classList.add('ellipses');\n                $ellipses.addEventListener('click', () => {\n                    $chroma.classList.add('open');\n                }, false);\n                $header.appendChild($ellipses);\n                const $copy = document.createElement('span');\n                $copy.insertAdjacentHTML('afterbegin', '<i class=\"far fa-copy fa-fw\"></i>');\n                $copy.classList.add('copy');\n                const code = $code.innerText;\n                if (this.config.code.maxShownLines < 0 || code.split('\\n').length < this.config.code.maxShownLines + 2) $chroma.classList.add('open');\n                if (this.config.code.copyTitle) {\n                    $copy.setAttribute('data-clipboard-text', code);\n                    $copy.title = this.config.code.copyTitle;\n                    const clipboard = new ClipboardJS($copy);\n                    clipboard.on('success', _e => {\n                        this.util.animateCSS($code, 'flash');\n                    });\n                    $header.appendChild($copy);\n                }\n                $chroma.insertBefore($header, $chroma.firstChild);\n            }\n        });\n    }\n\n    initTable() {\n        this.util.forEach(document.querySelectorAll('.content table'), $table => {\n            const $wrapper = document.createElement('div');\n            $wrapper.className = 'table-wrapper';\n            $table.parentElement.replaceChild($wrapper, $table);\n            $wrapper.appendChild($table);\n        });\n    }\n\n    initHeaderLink() {\n        for (let num = 1; num <= 6; num++) {\n            this.util.forEach(document.querySelectorAll('.single .content > h' + num), $header => {\n                $header.classList.add('headerLink');\n                $header.insertAdjacentHTML('afterbegin', `<a href=\"#${$header.id}\" class=\"header-mark\"></a>`);\n            });\n        }\n    }\n\n    initToc() {\n        const $tocCore = document.getElementById('TableOfContents');\n        if ($tocCore === null) return;\n        if (document.getElementById('toc-static').getAttribute('kept') || this.util.isTocStatic()) {\n            const $tocContentStatic = document.getElementById('toc-content-static');\n            if ($tocCore.parentElement !== $tocContentStatic) {\n                $tocCore.parentElement.removeChild($tocCore);\n                $tocContentStatic.appendChild($tocCore);\n            }\n            if (this._tocOnScroll) this.scrollEventSet.delete(this._tocOnScroll);\n        } else {\n            const $tocContentAuto = document.getElementById('toc-content-auto');\n            if ($tocCore.parentElement !== $tocContentAuto) {\n                $tocCore.parentElement.removeChild($tocCore);\n                $tocContentAuto.appendChild($tocCore);\n            }\n            const $toc = document.getElementById('toc-auto');\n            const $page = document.getElementsByClassName('page')[0];\n            const rect = $page.getBoundingClientRect();\n            $toc.style.left = `${rect.left + rect.width + 20}px`;\n            $toc.style.maxWidth = `${$page.getBoundingClientRect().left - 20}px`;\n            $toc.style.visibility = 'visible';\n            const $tocLinkElements = $tocCore.querySelectorAll('a:first-child');\n            const $tocLiElements = $tocCore.getElementsByTagName('li');\n            const $headerLinkElements = document.getElementsByClassName('headerLink');\n            const headerIsFixed = document.body.getAttribute('header-desktop') !== 'normal';\n            const headerHeight = document.getElementById('header-desktop').offsetHeight;\n            const TOP_SPACING = 20 + (headerIsFixed ? headerHeight : 0);\n            const minTocTop = $toc.offsetTop;\n            const minScrollTop = minTocTop - TOP_SPACING + (headerIsFixed ? 0 : headerHeight);\n            this._tocOnScroll = this._tocOnScroll || (() => {\n                const footerTop = document.getElementById('post-footer').offsetTop;\n                const maxTocTop = footerTop - $toc.getBoundingClientRect().height;\n                const maxScrollTop = maxTocTop - TOP_SPACING + (headerIsFixed ? 0 : headerHeight);\n                if (this.newScrollTop < minScrollTop) {\n                    $toc.style.position = 'absolute';\n                    $toc.style.top = `${minTocTop}px`;\n                } else if (this.newScrollTop > maxScrollTop) {\n                    $toc.style.position = 'absolute';\n                    $toc.style.top = `${maxTocTop}px`;\n                } else {\n                    $toc.style.position = 'fixed';\n                    $toc.style.top = `${TOP_SPACING}px`;\n                }\n\n                this.util.forEach($tocLinkElements, $tocLink => { $tocLink.classList.remove('active'); });\n                this.util.forEach($tocLiElements, $tocLi => { $tocLi.classList.remove('has-active'); });\n                const INDEX_SPACING = 20 + (headerIsFixed ? headerHeight : 0);\n                let activeTocIndex = $headerLinkElements.length - 1;\n                for (let i = 0; i < $headerLinkElements.length - 1; i++) {\n                    const thisTop = $headerLinkElements[i].getBoundingClientRect().top;\n                    const nextTop = $headerLinkElements[i + 1].getBoundingClientRect().top;\n                    if ((i == 0 && thisTop > INDEX_SPACING)\n                     || (thisTop <= INDEX_SPACING && nextTop > INDEX_SPACING)) {\n                        activeTocIndex = i;\n                        break;\n                    }\n                }\n                if (activeTocIndex !== -1) {\n                    $tocLinkElements[activeTocIndex].classList.add('active');\n                    let $parent = $tocLinkElements[activeTocIndex].parentElement;\n                    while ($parent !== $tocCore) {\n                        $parent.classList.add('has-active');\n                        $parent = $parent.parentElement.parentElement;\n                    }\n                }\n            });\n            this._tocOnScroll();\n            this.scrollEventSet.add(this._tocOnScroll);\n        }\n    }\n\n    initMath() {\n        if (this.config.math) renderMathInElement(document.body, this.config.math);\n    }\n\n    initMermaid() {\n        const $mermaidElements = document.getElementsByClassName('mermaid');\n        if ($mermaidElements.length) {\n            mermaid.initialize({startOnLoad: false, theme: 'null'});\n            this.util.forEach($mermaidElements, $mermaid => {\n                mermaid.mermaidAPI.render('svg-' + $mermaid.id, this.data[$mermaid.id], svgCode => {\n                    $mermaid.insertAdjacentHTML('afterbegin', svgCode);\n                }, $mermaid);\n            });\n        }\n    }\n\n    initEcharts() {\n        this._echartsOnSwitchTheme = this._echartsOnSwitchTheme || (() => {\n            this._echartsArr = this._echartsArr || [];\n            for (let i = 0; i < this._echartsArr.length; i++) {\n                this._echartsArr[i].dispose();\n            }\n            this._echartsArr = [];\n            this.util.forEach(document.getElementsByClassName('echarts'), $echarts => {\n                const chart = echarts.init($echarts, this.isDark ? 'dark' : 'macarons', {renderer: 'svg'});\n                chart.setOption(JSON.parse(this.data[$echarts.id]));\n                this._echartsArr.push(chart);\n            });\n        });\n        this.switchThemeEventSet.add(this._echartsOnSwitchTheme);\n        this._echartsOnSwitchTheme();\n        this._echartsOnResize = this._echartsOnResize || (() => {\n            for (let i = 0; i < this._echartsArr.length; i++) {\n                this._echartsArr[i].resize();\n            }\n        });\n        this.resizeEventSet.add(this._echartsOnResize);\n    }\n\n    initMapbox() {\n        if (this.config.mapbox) {\n            mapboxgl.accessToken = this.config.mapbox.accessToken;\n            mapboxgl.setRTLTextPlugin(this.config.mapbox.RTLTextPlugin);\n            this._mapboxArr = this._mapboxArr || [];\n            this.util.forEach(document.getElementsByClassName('mapbox'), $mapbox => {\n                const { lng, lat, zoom, lightStyle, darkStyle, marked, navigation, geolocate, scale, fullscreen } = this.data[$mapbox.id];\n                const mapbox = new mapboxgl.Map({\n                    container: $mapbox,\n                    center: [lng, lat],\n                    zoom: zoom,\n                    minZoom: .2,\n                    style: this.isDark ? darkStyle : lightStyle,\n                    attributionControl: false,\n                });\n                if (marked) {\n                    new mapboxgl.Marker().setLngLat([lng, lat]).addTo(mapbox);\n                }\n                if (navigation) {\n                    mapbox.addControl(new mapboxgl.NavigationControl(), 'bottom-right');\n                }\n                if (geolocate) {\n                    mapbox.addControl(new mapboxgl.GeolocateControl({\n                        positionOptions: {\n                            enableHighAccuracy: true,\n                        },\n                        showUserLocation: true,\n                        trackUserLocation: true,\n                    }), 'bottom-right');\n                }\n                if (scale) {\n                    mapbox.addControl(new mapboxgl.ScaleControl());\n                }\n                if (fullscreen) {\n                    mapbox.addControl(new mapboxgl.FullscreenControl());\n                }\n                mapbox.addControl(new MapboxLanguage());\n                this._mapboxArr.push(mapbox);\n            });\n            this._mapboxOnSwitchTheme = this._mapboxOnSwitchTheme || (() => {\n                this.util.forEach(this._mapboxArr, mapbox => {\n                    const $mapbox = mapbox.getContainer();\n                    const { lightStyle, darkStyle } = this.data[$mapbox.id];\n                    mapbox.setStyle(this.isDark ? darkStyle : lightStyle);\n                    mapbox.addControl(new MapboxLanguage());\n                });\n            });\n            this.switchThemeEventSet.add(this._mapboxOnSwitchTheme);\n        }\n    }\n\n    initTypeit() {\n        if (this.config.typeit) {\n            const typeitConfig = this.config.typeit;\n            const speed = typeitConfig.speed ? typeitConfig.speed : 100;\n            const cursorSpeed = typeitConfig.cursorSpeed ? typeitConfig.cursorSpeed : 1000;\n            const cursorChar = typeitConfig.cursorChar ? typeitConfig.cursorChar : '|';\n            Object.values(typeitConfig.data).forEach(group => {\n                const typeone = (i) => {\n                    const id = group[i];\n                    const instance = new TypeIt(`#${id}`, {\n                        strings: this.data[id],\n                        speed: speed,\n                        lifeLike: true,\n                        cursorSpeed: cursorSpeed,\n                        cursorChar: cursorChar,\n                        waitUntilVisible: true,\n                        afterComplete: () => {\n                            if (i === group.length - 1) {\n                                if (typeitConfig.duration >= 0) window.setTimeout(() => {\n                                    instance.destroy();\n                                }, typeitConfig.duration);\n                                return;\n                            }\n                            instance.destroy();\n                            typeone(i + 1);\n                        },\n                    }).go();\n                };\n                typeone(0);\n            });\n        }\n    }\n\n    initComment() {\n        if (this.config.comment) {\n            if (this.config.comment.gitalk) {\n                this.config.comment.gitalk.body = decodeURI(window.location.href);\n                const gitalk = new Gitalk(this.config.comment.gitalk);\n                gitalk.render('gitalk');\n            }\n            if (this.config.comment.valine) new Valine(this.config.comment.valine);\n            if (this.config.comment.utterances) {\n                const utterancesConfig = this.config.comment.utterances;\n                const script = document.createElement('script');\n                script.src = 'https://utteranc.es/client.js';\n                script.type = 'text/javascript';\n                script.setAttribute('repo', utterancesConfig.repo);\n                script.setAttribute('issue-term', utterancesConfig.issueTerm);\n                if (utterancesConfig.label) script.setAttribute('label', utterancesConfig.label);\n                script.setAttribute('theme', this.isDark ? utterancesConfig.darkTheme : utterancesConfig.lightTheme);\n                script.crossOrigin = 'anonymous';\n                script.async = true;\n                document.getElementById('utterances').appendChild(script);\n                this._utterancesOnSwitchTheme = this._utterancesOnSwitchTheme || (() => {\n                    const message = {\n                        type: 'set-theme',\n                        theme: this.isDark ? utterancesConfig.darkTheme : utterancesConfig.lightTheme,\n                    };\n                    const iframe = document.querySelector('.utterances-frame');\n                    iframe.contentWindow.postMessage(message, 'https://utteranc.es');\n                });\n                this.switchThemeEventSet.add(this._utterancesOnSwitchTheme);\n            }\n        }\n    }\n\n    initCookieconsent() {\n        if (this.config.cookieconsent) cookieconsent.initialise(this.config.cookieconsent);\n    }\n\n    onScroll() {\n        const $headers = [];\n        if (document.body.getAttribute('header-desktop') === 'auto') $headers.push(document.getElementById('header-desktop'));\n        if (document.body.getAttribute('header-mobile') === 'auto') $headers.push(document.getElementById('header-mobile'));\n        if (document.getElementById('comments')) {\n            const $viewComments = document.getElementById('view-comments');\n            $viewComments.href = `#comments`;\n            $viewComments.style.display = 'block';\n        }\n        const $fixedButtons = document.getElementById('fixed-buttons');\n        const ACCURACY = 20, MINIMUM = 100;\n        window.addEventListener('scroll', () => {\n            this.newScrollTop = this.util.getScrollTop();\n            const scroll = this.newScrollTop - this.oldScrollTop;\n            const isMobile = this.util.isMobile();\n            this.util.forEach($headers, $header => {\n                if (scroll > ACCURACY) {\n                    $header.classList.remove('fadeInDown');\n                    this.util.animateCSS($header, ['fadeOutUp', 'faster'], true);\n                } else if (scroll < - ACCURACY) {\n                    $header.classList.remove('fadeOutUp');\n                    this.util.animateCSS($header, ['fadeInDown', 'faster'], true);\n                }\n            });\n            if (this.newScrollTop > MINIMUM) {\n                if (isMobile && scroll > ACCURACY) {\n                    $fixedButtons.classList.remove('fadeIn');\n                    this.util.animateCSS($fixedButtons, ['fadeOut', 'faster'], true);\n                } else if (!isMobile || scroll < - ACCURACY) {\n                    $fixedButtons.style.display = 'block';\n                    $fixedButtons.classList.remove('fadeOut');\n                    this.util.animateCSS($fixedButtons, ['fadeIn', 'faster'], true);\n                }\n            } else {\n                if (!isMobile) {\n                    $fixedButtons.classList.remove('fadeIn');\n                    this.util.animateCSS($fixedButtons, ['fadeOut', 'faster'], true);\n                }\n                $fixedButtons.style.display = 'none';\n            }\n            for (let event of this.scrollEventSet) event();\n            this.oldScrollTop = this.newScrollTop;\n        }, false);\n    }\n\n    onResize() {\n        window.addEventListener('resize', () => {\n            if (!this._resizeTimeout) {\n                this._resizeTimeout = window.setTimeout(() => {\n                    this._resizeTimeout = null;\n                    for (let event of this.resizeEventSet) event();\n                    this.initToc();\n                    this.initMermaid();\n                    this.initSearch();\n                }, 100);\n            }\n        }, false);\n    }\n\n    onClickMask() {\n        document.getElementById('mask').addEventListener('click', () => {\n            for (let event of this.clickMaskEventSet) event();\n            document.body.classList.remove('blur');\n        }, false);\n    }\n\n    init() {\n        try {\n            this.initSVGIcon();\n            this.initTwemoji();\n            this.initMenuMobile();\n            this.initSwitchTheme();\n            this.initSearch();\n            this.initDetails();\n            this.initLightGallery();\n            this.initHighlight();\n            this.initTable();\n            this.initHeaderLink();\n            this.initMath();\n            this.initMermaid();\n            this.initEcharts();\n            this.initTypeit();\n            this.initMapbox();\n            this.initCookieconsent();\n        } catch (err) {\n            console.error(err);\n        }\n\n        window.setTimeout(() => {\n            this.initToc();\n            this.initComment();\n\n            this.onScroll();\n            this.onResize();\n            this.onClickMask();\n        }, 100);\n    }\n}\n\nconst themeInit = () => {\n    const theme = new Theme();\n    theme.init();\n};\n\nif (document.readyState !== 'loading') {\n    themeInit();\n} else {\n    document.addEventListener('DOMContentLoaded', themeInit, false);\n}\n"]}
\ No newline at end of file
diff --git a/exampleSite/config.toml b/exampleSite/config.toml
index d87632c1..df4403b8 100644
--- a/exampleSite/config.toml
+++ b/exampleSite/config.toml
@@ -104,12 +104,14 @@ enableEmoji = true
         noFavicon = false
         # modern SVG favicon to use in place of older style .png and .ico files
         svgFavicon = ""
-        # Android browser theme color
-        themeColor = "#ffffff"
         # Safari mask icon color
         iconColor = "#5bbad5"
         # Windows v8-10 tile color
         tileColor = "#da532c"
+        # Android browser theme color
+        [languages.en.params.app.themeColor]
+          light = "#ffffff"
+          dark = "#252627"
       # Search config
       [languages.en.params.search]
         enable = true
@@ -304,12 +306,14 @@ enableEmoji = true
         noFavicon = false
         # 更现代的 SVG 网站图标, 可替代旧的 .png 和 .ico 文件
         svgFavicon = ""
-        # Android 浏览器主题色
-        themeColor = "#ffffff"
         # Safari 图标颜色
         iconColor = "#5bbad5"
         # Windows v8-10 磁贴颜色
         tileColor = "#da532c"
+        # Android 浏览器主题色
+        [languages.zh-cn.params.app.themeColor]
+          light = "#ffffff"
+          dark = "#252627"
       # 搜索配置
       [languages.zh-cn.params.search]
         enable = true
@@ -500,12 +504,14 @@ enableEmoji = true
         noFavicon = false
         # modern SVG favicon to use in place of older style .png and .ico files
         svgFavicon = ""
-        # Android browser theme color
-        themeColor = "#ffffff"
         # Safari mask icon color
         iconColor = "#5bbad5"
         # Windows v8-10 tile color
         tileColor = "#da532c"
+        # Android browser theme color
+        [languages.fr.params.app.themeColor]
+          light = "#ffffff"
+          dark = "#252627"
       # Search config
       [languages.fr.params.search]
         enable = true
@@ -639,6 +645,9 @@ enableEmoji = true
   # website images for Open Graph and Twitter Cards
   # 网站图片, 用于 Open Graph 和 Twitter Cards
   images = ["/logo.png"]
+  # enable PWA
+  # 开启 PWA 支持
+  enablePWA = true
 
   # Header config
   # 页面头部导航栏配置
diff --git a/layouts/_default/baseof.html b/layouts/_default/baseof.html
index 43030156..6b4d91a7 100644
--- a/layouts/_default/baseof.html
+++ b/layouts/_default/baseof.html
@@ -2,50 +2,71 @@
 
 <!DOCTYPE html>
 <html lang="{{ .Site.LanguageCode }}">
-    <head>
-        <meta charset="utf-8">
-        <meta name="viewport" content="width=device-width, initial-scale=1">
-        <meta name="robots" content="noodp" />
-        <meta http-equiv="X-UA-Compatible" content="IE=edge, chrome=1">
-        <title>
-            {{- block "title" . }}{{ .Site.Title }}{{ end -}}
-        </title>
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="robots" content="noodp" />
+    <meta http-equiv="X-UA-Compatible" content="IE=edge, chrome=1">
+    <title>
+      {{- block "title" . }}{{ .Site.Title }}{{ end -}}
+    </title>
 
-        {{- partial "head/meta.html" . -}}
-        {{- partial "head/link.html" . -}}
-        {{- partial "head/seo.html" . -}}
-    </head>
-    <body header-desktop="{{ .Site.Params.header.desktopMode }}" header-mobile="{{ .Site.Params.header.mobileMode }}">
-        {{- /* Check theme isDark before body rendering */ -}}
-        {{- $theme := .Site.Params.defaulttheme -}}
-        <script type="text/javascript">(window.localStorage && localStorage.getItem('theme') ? localStorage.getItem('theme') === 'dark' : ('{{ $theme }}' === 'auto' ? window.matchMedia('(prefers-color-scheme: dark)').matches : '{{ $theme }}' === 'dark')) && document.body.setAttribute('theme', 'dark');</script>
+    {{- partial "head/meta.html" . -}}
+    {{- partial "head/link.html" . -}}
+    {{- partial "head/seo.html" . -}}
+  </head>
+  <body header-desktop="{{ .Site.Params.header.desktopMode }}" header-mobile="{{ .Site.Params.header.mobileMode }}">
+    {{- /* Check theme isDark before body rendering */ -}}
+    {{- $theme := .Site.Params.defaulttheme -}}
+    <script type="text/javascript">(window.localStorage && localStorage.getItem('theme') ? localStorage.getItem('theme') === 'dark' : ('{{ $theme }}' === 'auto' ? window.matchMedia('(prefers-color-scheme: dark)').matches : '{{ $theme }}' === 'dark')) && document.body.setAttribute('theme', 'dark');</script>
 
-        <div id="mask"></div>
+    <div id="mask"></div>
 
-        {{- /* Body wrapper */ -}}
-        <div class="wrapper">
-            {{- partial "header.html" . -}}
-            <main class="main">
-                <div class="container">
-                    {{- block "content" . }}{{ end -}}
-                </div>
-            </main>
-            {{- partial "footer.html" . -}}
+    {{- /* Body wrapper */ -}}
+    <div class="wrapper">
+      {{- partial "header.html" . -}}
+      <main class="main">
+        <div class="container">
+          {{- block "content" . }}{{ end -}}
         </div>
+      </main>
+      {{- partial "footer.html" . -}}
+    </div>
 
-        <div id="fixed-buttons">
-            {{- /* top button */ -}}
-            <a href="#" id="back-to-top" class="fixed-button" title="{{ T `backToTop` }}">
-                <i class="fas fa-arrow-up fa-fw"></i>
-            </a>
+    <div id="fixed-buttons">
+      {{- /* top button */ -}}
+      <a href="#" id="back-to-top" class="fixed-button" title="{{ T `backToTop` }}">
+        <i class="fas fa-arrow-up fa-fw"></i>
+      </a>
 
-            {{- /* comment button */ -}}
-            <a href="#" id="view-comments" class="fixed-button" title="{{ T `viewComments` }}">
-                <i class="fas fa-comment fa-fw"></i>
-            </a>
-        </div>
+      {{- /* comment button */ -}}
+      <a href="#" id="view-comments" class="fixed-button" title="{{ T `viewComments` }}">
+        <i class="fas fa-comment fa-fw"></i>
+      </a>
+    </div>
 
-        {{- /* Load JavaScript scripts and CSS */ -}}
-        {{- partial "assets.html" . -}}
-    </body>
+    {{- /* PWA */ -}}
+    {{- if eq .Site.Params.enablePWA true -}}
+      {{- if eq hugo.Environment "production" -}}
+        <script type="text/javascript">
+          if ('serviceWorker' in navigator) {
+            navigator.serviceWorker
+              .register('/service-worker.min.js', { scope: '/' })
+              .then(function (registration) {
+                // console.log('Service Worker Registered');
+              })
+              .catch(function (error) {
+                console.error('error: ', error);
+              });
+            navigator.serviceWorker.ready.then(function (registration) {
+              // console.log('Service Worker Ready');
+            });
+          }
+        </script>
+      {{- end -}}
+    {{- end -}}
+
+    {{- /* Load JavaScript scripts and CSS */ -}}
+    {{- partial "assets.html" . -}}
+  </body>
 </html>
diff --git a/layouts/partials/footer.html b/layouts/partials/footer.html
index f0fe6c5b..c7065aa4 100644
--- a/layouts/partials/footer.html
+++ b/layouts/partials/footer.html
@@ -1,58 +1,57 @@
 {{- if ne .Site.Params.footer.enable false -}}
-    <footer class="footer">
-        <div class="footer-container">
-            {{- /* Custom Content */ -}}
-            {{- with .Site.Params.footer.custom -}}
-                <div class="footer-line">
-                    {{- safeHTML . -}}
-                </div>
-            {{- end -}}
-            <!-- <i class="fas fa-bug fa-fw"></i> -->
-            {{- /* Hugo and FixIt */ -}}
-            {{- if ne .Site.Params.footer.hugo false -}}
-                <div class="footer-line">
-                    {{- $hugo := printf `<a href="https://gohugo.io/" target="_blank" rel="noopener noreffer" title="Hugo %v">Hugo</a>` hugo.Version -}}
-                    {{- $theme := .Scratch.Get "version" | printf 
-                      `<a href="https://github.com/Lruihao/FixIt" target="_blank" rel="noopener noreffer" title="FixIt %v">
-                        <i class="fa-stack fa-xs">
-                          <i class="fas fa-bug fa-stack-1x"></i>
-                          <i class="fas fa-ban fa-stack-2x"></i>
-                        </i>
-                        FixIt
-                      </a>` -}}
-                    {{- dict "Hugo" $hugo "Theme" $theme | T "poweredBySome" | safeHTML }}
-                </div>
-            {{- end -}}
-
-            <div class="footer-line">
-                {{- /* Copyright year */ -}}
-                {{- if ne .Site.Params.footer.copyright false -}}
-                    <i class="far fa-copyright fa-fw"></i>
-                    {{- with .Site.Params.footer.since -}}
-                        <span itemprop="copyrightYear">
-                            {{- if lt . now.Year }}{{ . }} - {{ end }}{{ now.Year -}}
-                        </span>
-                    {{- else -}}
-                        <span itemprop="copyrightYear">{{ now.Year }}</span>
-                    {{- end -}}
-                {{- end -}}
-
-                {{- /* Author */ -}}
-                {{- if ne .Site.Params.footer.author false -}}
-                    <span class="author" itemprop="copyrightHolder">&nbsp;<a href="{{ $.Site.Author.link | default .Site.Home.RelPermalink }}" target="_blank">{{ .Site.Author.name }}</a></span>
-                {{- end -}}
-
-                {{- /* License */ -}}
-                {{- with .Site.Params.footer.license -}}
-                    &nbsp;|&nbsp;<span class="license">{{ . | safeHTML }}</span>
-                {{- end -}}
-
-                {{- /* ICP */ -}}
-                {{- with .Site.Params.footer.icp -}}
-                    <span class="icp-splitter">&nbsp;|&nbsp;</span><br class="icp-br"/>
-                    <span class="icp">{{ . | safeHTML }}</span>
-                {{- end -}}
-            </div>
+  <footer class="footer">
+    <div class="footer-container">
+      {{- /* Custom Content */ -}}
+      {{- with .Site.Params.footer.custom -}}
+        <div class="footer-line">
+          {{- safeHTML . -}}
         </div>
-    </footer>
+      {{- end -}}
+      {{- /* Hugo and FixIt */ -}}
+      {{- if ne .Site.Params.footer.hugo false -}}
+        <div class="footer-line">
+          {{- $hugo := printf `<a href="https://gohugo.io/" target="_blank" rel="noopener noreffer" title="Hugo %v">Hugo</a>` hugo.Version -}}
+          {{- $theme := .Scratch.Get "version" | printf 
+            `<a href="https://github.com/Lruihao/FixIt" target="_blank" rel="noopener noreffer" title="FixIt %v">
+            <i class="fa-stack fa-xs">
+              <i class="fas fa-bug fa-stack-1x"></i>
+              <i class="fas fa-ban fa-stack-2x"></i>
+            </i>
+            FixIt
+            </a>` -}}
+          {{- dict "Hugo" $hugo "Theme" $theme | T "poweredBySome" | safeHTML }}
+        </div>
+      {{- end -}}
+
+      <div class="footer-line">
+        {{- /* Copyright year */ -}}
+        {{- if ne .Site.Params.footer.copyright false -}}
+          <i class="far fa-copyright fa-fw"></i>
+          {{- with .Site.Params.footer.since -}}
+            <span itemprop="copyrightYear">
+              {{- if lt . now.Year }}{{ . }} - {{ end }}{{ now.Year -}}
+            </span>
+          {{- else -}}
+            <span itemprop="copyrightYear">{{ now.Year }}</span>
+          {{- end -}}
+        {{- end -}}
+
+        {{- /* Author */ -}}
+        {{- if ne .Site.Params.footer.author false -}}
+          <span class="author" itemprop="copyrightHolder">&nbsp;<a href="{{ $.Site.Author.link | default .Site.Home.RelPermalink }}" target="_blank">{{ .Site.Author.name }}</a></span>
+        {{- end -}}
+
+        {{- /* License */ -}}
+        {{- with .Site.Params.footer.license -}}
+          &nbsp;|&nbsp;<span class="license">{{ . | safeHTML }}</span>
+        {{- end -}}
+
+        {{- /* ICP */ -}}
+        {{- with .Site.Params.footer.icp -}}
+          <span class="icp-splitter">&nbsp;|&nbsp;</span><br class="icp-br"/>
+          <span class="icp">{{ . | safeHTML }}</span>
+        {{- end -}}
+      </div>
+    </div>
+  </footer>
 {{- end -}}
diff --git a/layouts/partials/head/meta.html b/layouts/partials/head/meta.html
index 0862b835..2f987011 100644
--- a/layouts/partials/head/meta.html
+++ b/layouts/partials/head/meta.html
@@ -8,10 +8,14 @@
 <meta name="application-name" content="{{ .Site.Params.app.title | default .Site.Title }}">
 <meta name="apple-mobile-web-app-title" content="{{ .Site.Params.app.title | default .Site.Title }}">
 
-{{- with .Site.Params.app.themeColor -}}
-    <meta name="theme-color" content="{{ . }}">
+{{- with .Site.Params.app.themeColor.light -}}
+  <meta name="theme-color" media="(prefers-color-scheme: light)" content="{{ . }}">
+{{- end -}}
+
+{{- with .Site.Params.app.themeColor.dark -}}
+  <meta name="theme-color" media="(prefers-color-scheme: dark)" content="{{ . }}">
 {{- end -}}
 
 {{- with .Site.Params.app.tileColor -}}
-    <meta name="msapplication-TileColor" content="{{ . }}">
+  <meta name="msapplication-TileColor" content="{{ . }}">
 {{- end -}}
diff --git a/package-lock.json b/package-lock.json
index d31ace37..476003b4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3972,7 +3972,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.5",
-          "resolved": "https://registry.nlark.com/minimist/download/minimist-1.2.5.tgz",
+          "resolved": "https://registry.nlark.com/minimist/download/minimist-1.2.5.tgz?cache=0&sync_timestamp=1618847017774&other_urls=https%3A%2F%2Fregistry.nlark.com%2Fminimist%2Fdownload%2Fminimist-1.2.5.tgz",
           "integrity": "sha1-Z9ZgFLZqaoqqDAg8X9WN9OTpdgI=",
           "dev": true
         }
@@ -4620,7 +4620,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.5",
-          "resolved": "https://registry.nlark.com/minimist/download/minimist-1.2.5.tgz",
+          "resolved": "https://registry.nlark.com/minimist/download/minimist-1.2.5.tgz?cache=0&sync_timestamp=1618847017774&other_urls=https%3A%2F%2Fregistry.nlark.com%2Fminimist%2Fdownload%2Fminimist-1.2.5.tgz",
           "integrity": "sha1-Z9ZgFLZqaoqqDAg8X9WN9OTpdgI=",
           "dev": true
         }
@@ -4728,7 +4728,7 @@
     },
     "minimist": {
       "version": "1.2.5",
-      "resolved": "https://registry.nlark.com/minimist/download/minimist-1.2.5.tgz",
+      "resolved": "https://registry.nlark.com/minimist/download/minimist-1.2.5.tgz?cache=0&sync_timestamp=1618847017774&other_urls=https%3A%2F%2Fregistry.nlark.com%2Fminimist%2Fdownload%2Fminimist-1.2.5.tgz",
       "integrity": "sha1-Z9ZgFLZqaoqqDAg8X9WN9OTpdgI=",
       "dev": true
     },
@@ -5272,9 +5272,9 @@
           "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
           "dev": true,
           "requires": {
-            "inherits": "^2.0.3",
-            "string_decoder": "^1.1.1",
-            "util-deprecate": "^1.0.1"
+            "inherits": "2.0.4",
+            "string_decoder": "1.1.1",
+            "util-deprecate": "1.0.2"
           }
         }
       }
@@ -5329,7 +5329,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.5",
-          "resolved": "https://registry.nlark.com/minimist/download/minimist-1.2.5.tgz",
+          "resolved": "https://registry.nlark.com/minimist/download/minimist-1.2.5.tgz?cache=0&sync_timestamp=1618847017774&other_urls=https%3A%2F%2Fregistry.nlark.com%2Fminimist%2Fdownload%2Fminimist-1.2.5.tgz",
           "integrity": "sha1-Z9ZgFLZqaoqqDAg8X9WN9OTpdgI=",
           "dev": true
         }
diff --git a/package.json b/package.json
index abc57820..542f7f44 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   },
   "scripts": {
     "preinstall": "npx npm-force-resolutions",
-    "babel": "npx babel src/js --out-file assets/js/theme.min.js --source-maps",
+    "babel": "npx babel src/js/theme.js --out-file assets/js/theme.min.js --source-maps --no-comments && npx babel src/js/service-worker.js --out-file static/service-worker.min.js --source-maps --no-comments",
     "build": "npm run babel && hugo -v --source=exampleSite --themesDir ../.. --gc",
     "build-lunr-segmentit": "browserify src/lib/lunr.segmentit.js -o assets/lib/lunr/lunr.segmentit.js -t babelify --presets @babel/preset-env --presets minify",
     "start": "npm run babel && hugo server --source=exampleSite --themesDir ../.. -D --disableFastRender",
diff --git a/src/js/service-worker.js b/src/js/service-worker.js
new file mode 100644
index 00000000..4d1646e7
--- /dev/null
+++ b/src/js/service-worker.js
@@ -0,0 +1,262 @@
+const CACHE_VERSION = 1;
+
+const BASE_CACHE_FILES = [
+  '/css/style.min.css',
+  '/js/theme.min.js',
+  '/site.webmanifest'
+];
+
+const OFFLINE_CACHE_FILES = [
+  '/css/style.min.css',
+  '/js/theme.min.js',
+  '/site.webmanifest',
+  '/offline'
+];
+
+const NOT_FOUND_CACHE_FILES = [
+  '/css/style.min.css',
+  '/js/theme.min.js',
+  '/site.webmanifest',
+  '/404.html'
+];
+
+const OFFLINE_PAGE = '/offline';
+const NOT_FOUND_PAGE = '/404.html';
+
+const CACHE_VERSIONS = {
+  assets: 'assets-v' + CACHE_VERSION,
+  content: 'content-v' + CACHE_VERSION,
+  offline: 'offline-v' + CACHE_VERSION,
+  notFound: '404-v' + CACHE_VERSION
+};
+
+// Define MAX_TTL's in SECONDS for specific file extensions
+const MAX_TTL = {
+  '/': 3600,
+  html: 3600,
+  json: 86400,
+  js: 86400,
+  css: 86400
+};
+
+const CACHE_BLACKLIST = [
+  (str) => {
+    return !str.startsWith('http://localhost');
+  }
+];
+
+const SUPPORTED_METHODS = ['GET'];
+
+/**
+ * isBlackListed
+ * @param {string} url
+ * @returns {boolean}
+ */
+function isBlacklisted(url) {
+  return CACHE_BLACKLIST.length > 0
+    ? !CACHE_BLACKLIST.filter((rule) => {
+        if (typeof rule === 'function') {
+          return !rule(url);
+        } else {
+          return false;
+        }
+      }).length
+    : false;
+}
+
+/**
+ * getFileExtension
+ * @param {string} url
+ * @returns {string}
+ */
+function getFileExtension(url) {
+  const extension = url.split('.').reverse()[0].split('?')[0];
+  return extension.endsWith('/') ? '/' : extension;
+}
+
+/**
+ * getTTL
+ * @param {string} url
+ */
+function getTTL(url) {
+  if (typeof url === 'string') {
+    const extension = getFileExtension(url);
+    if (typeof MAX_TTL[extension] === 'number') {
+      return MAX_TTL[extension];
+    } else {
+      return null;
+    }
+  } else {
+    return null;
+  }
+}
+
+/**
+ * installServiceWorker
+ * @returns {Promise}
+ */
+function installServiceWorker() {
+  return Promise.all([
+    caches.open(CACHE_VERSIONS.assets).then((cache) => {
+      return cache.addAll(BASE_CACHE_FILES);
+    }),
+    caches.open(CACHE_VERSIONS.offline).then((cache) => {
+      return cache.addAll(OFFLINE_CACHE_FILES);
+    }),
+    caches.open(CACHE_VERSIONS.notFound).then((cache) => {
+      return cache.addAll(NOT_FOUND_CACHE_FILES);
+    })
+  ]).then(() => {
+    return self.skipWaiting();
+  });
+}
+
+/**
+ * cleanupLegacyCache
+ * @returns {Promise}
+ */
+function cleanupLegacyCache() {
+  const currentCaches = Object.keys(CACHE_VERSIONS).map((key) => {
+    return CACHE_VERSIONS[key];
+  });
+
+  return new Promise((resolve, reject) => {
+    caches
+      .keys()
+      .then((keys) => {
+        return keys.filter((key) => {
+          return !~currentCaches.indexOf(key);
+        });
+      })
+      .then((legacy) => {
+        if (legacy.length) {
+          Promise.all(
+            legacy.map((legacyKey) => {
+              return caches.delete(legacyKey);
+            })
+          )
+            .then(() => {
+              resolve();
+            })
+            .catch((err) => {
+              reject(err);
+            });
+        } else {
+          resolve();
+        }
+      })
+      .catch((err) => {
+        reject(err);
+      });
+  });
+}
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(Promise.all([installServiceWorker(), self.skipWaiting()]));
+});
+
+// The activate handler takes care of cleaning up old caches.
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    Promise.all([
+      cleanupLegacyCache(),
+      self.clients.claim(),
+      self.skipWaiting()
+    ]).catch((err) => {
+      console.log(err);
+      self.skipWaiting();
+    })
+  );
+});
+
+self.addEventListener('fetch', (event) => {
+  event.respondWith(
+    caches.open(CACHE_VERSIONS.content).then((cache) => {
+      return cache
+        .match(event.request)
+        .then((response) => {
+          if (response) {
+            const headers = response.headers.entries();
+            let date = null;
+
+            for (const pair of headers) {
+              if (pair[0] === 'date') {
+                date = new Date(pair[1]);
+              }
+            }
+            if (date) {
+              const age = parseInt(
+                (new Date().getTime() - date.getTime()) / 1000
+              );
+              const ttl = getTTL(event.request.url);
+
+              if (ttl && age > ttl) {
+                return new Promise((resolve) => {
+                  return fetch(event.request.clone())
+                    .then((updatedResponse) => {
+                      if (updatedResponse) {
+                        cache.put(event.request, updatedResponse.clone());
+                        resolve(updatedResponse);
+                      } else {
+                        resolve(response);
+                      }
+                    })
+                    .catch(() => {
+                      resolve(response);
+                    });
+                }).catch((err) => {
+                  console.log(err);
+                  return response;
+                });
+              } else {
+                return response;
+              }
+            } else {
+              return response;
+            }
+          } else {
+            return null;
+          }
+        })
+        .then((response) => {
+          if (response) {
+            return response;
+          } else {
+            return fetch(event.request.clone())
+              .then((response) => {
+                if (response.status < 400) {
+                  if (
+                    ~SUPPORTED_METHODS.indexOf(event.request.method) &&
+                    !isBlacklisted(event.request.url) &&
+                    event.request.url.slice(0, 4) === 'http'
+                  ) {
+                    cache.put(event.request, response.clone());
+                  }
+                  return response;
+                } else {
+                  return caches.open(CACHE_VERSIONS.notFound).then((cache) => {
+                    return cache.match(NOT_FOUND_PAGE);
+                  });
+                }
+              })
+              .then((response) => {
+                if (response) {
+                  return response;
+                }
+              })
+              .catch(() => {
+                return caches
+                  .open(CACHE_VERSIONS.offline)
+                  .then((offlineCache) => {
+                    return offlineCache.match(OFFLINE_PAGE);
+                  });
+              });
+          }
+        })
+        .catch((error) => {
+          console.error('  Error in fetch handler:', error);
+          throw error;
+        });
+    })
+  );
+});
diff --git a/static/service-worker.min.js b/static/service-worker.min.js
new file mode 100644
index 00000000..4fb36d2a
--- /dev/null
+++ b/static/service-worker.min.js
@@ -0,0 +1,3 @@
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\ No newline at end of file
diff --git a/static/service-worker.min.js.map b/static/service-worker.min.js.map
new file mode 100644
index 00000000..bc9cc3ab
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