diff --git a/CHANGELOG.md b/CHANGELOG.md
index b520cfee..2cbedcf5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ All notable changes to this project will be documented in this file.
 - :wheelchair: Feat(accessibility): use `aria-hidden=true` on icons that AT should ignore
 - :recycle: Refactor: image rendering
 - :recycle: Refactor: back to top and scroll to comments
+- :recycle: Refactor: custom.js rendering and remove `params.customJS` ([#189](https://github.com/hugo-fixit/FixIt/pull/189))
 - :bug: Fix: add function `dos2unix` to unify new lines symbol between Windows and Unix/Mac OS
 - :bug: Fix: author display error in post and markdown file
 - :bug: Fix: use data attributes or class replace for custom attributes
diff --git a/assets/js/_custom.js b/assets/js/custom.js.example
similarity index 63%
rename from assets/js/_custom.js
rename to assets/js/custom.js.example
index a77c8533..2c4c28dc 100644
--- a/assets/js/_custom.js
+++ b/assets/js/custom.js.example
@@ -1,20 +1,20 @@
 /**
+ * Custom javascript for FixIt site.
  * @author @Lruihao https://lruihao.cn
- * @description Custom javascript for the hugo theme FixIt.
  */
-const CustomJS = new (function () {
+const FixItCustom = new (function () {
   /**
    * Hello World
    * You can define your own functions below.
-   * @returns {CustomJS}
+   * @returns {FixItCustom}
    */
   this.hello = () => {
-    // console.log('Hello CustomJS!');
+    console.log('FixItCustom echo: Hello FixIt!');
     return this;
-  }
+  };
   /**
    * Initialize.
-   * @returns {CustomJS}
+   * @returns {FixItCustom}
    */
   this.init = () => {
     // Custom infos.
@@ -27,9 +27,9 @@ const CustomJS = new (function () {
  * Immediate.
  */
 (() => {
-  CustomJS.init();
+  FixItCustom.init();
   // It will be executed when the DOM tree is built.
   document.addEventListener('DOMContentLoaded', () => {
-    // console.log('DOM content loaded!')
+    // FixItCustom.init();
   });
 })();
diff --git a/config.toml b/config.toml
index 0ada434d..1df1c0e1 100644
--- a/config.toml
+++ b/config.toml
@@ -664,13 +664,7 @@
     polyfill = false
     # whether to use object-fit-images to be compatible with older browsers
     objectFit = false
-  
-  # FixIt 0.2.12 | NEW Custom JS at last
-  # "_custom.js" located in "themes/FixIt/assets/js/"
-  # you can store your custom JS file in the same path under your project:
-  # "assets/js/_custom.js"
-  [params.customJS]
-    enable = true
+
   # FixIt 0.2.14 | NEW GitHub banner in the top-right or top-left corner
   [params.githubCorner]
     enable = false
diff --git a/docs b/docs
index 99725861..c63bb5cc 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit 997258619cb5f76207ff077f51b4cdf8cd86c743
+Subproject commit c63bb5cc070c8f7997d649440096c818a9460ce0
diff --git a/layouts/partials/assets.html b/layouts/partials/assets.html
index 44a91477..bc05527b 100644
--- a/layouts/partials/assets.html
+++ b/layouts/partials/assets.html
@@ -235,8 +235,8 @@
   {{- $options := dict -}}
   {{- $options = dict "targetPath" "service-worker.min.js" | merge $options -}}
   {{- $options = dict "minify" true | merge $options -}}
-  {{- $js := resources.Get "js/service-worker.js" | js.Build $options -}}
-  {{- $_ := $js.RelPermalink -}}
+  {{- $source := resources.Get "js/service-worker.js" | js.Build $options -}}
+  {{- $_ := $source.RelPermalink -}}
   {{- $config = dict "enablePWA" .Site.Params.enablePWA | merge $config -}}
 {{- end -}}
 
@@ -263,9 +263,8 @@
 {{- $_ := (resources.Get "js/theme.min.js.map").RelPermalink -}}
 
 {{- /* Custom script */ -}}
-{{- if eq .Site.Params.customJS.enable true -}}
-  {{- $source := "js/_custom.js" -}}
-  {{- dict "Source" $source "Minify" true "Fingerprint" $fingerprint "Defer" true | dict "Scratch" .Scratch "Data" | partial "scratch/script.html" -}}
+{{- with ((resources.Get "js/custom.js") | default (resources.Get "js/_custom.js")) -}}
+  {{- dict "Source" .RelPermalink "Minify" true "Fingerprint" $fingerprint "Defer" true | dict "Scratch" $.Scratch "Data" | partial "scratch/script.html" -}}
 {{- end -}}
 
 {{- with (.Scratch.Get "this").scriptArr -}}