diff --git a/exampleSite/assets/js/_custom.js b/exampleSite/assets/js/_custom.js
new file mode 100644
index 00000000..ae15ba37
--- /dev/null
+++ b/exampleSite/assets/js/_custom.js
@@ -0,0 +1,36 @@
+/**
+ * @author @Lruihao https://lruihao.cn
+ * @description Custom javascript for the hugo theme FixIt.
+ */
+const CustomJS = new (function () {
+  /**
+   * Rest in Peace. R.I.P 🕯️
+   * @2022-3-28 [3.21-mu5735] 沉痛哀悼 132 名遇难同胞：东航航班失事，遇难者含旅客 123 人，机组 9 人
+   * @returns {CustomJS}
+   */
+  this.RIP = () => {
+    if (new Date() < new Date('2022-03-31')) {
+      document.querySelector('html').style.filter = 'grayscale(100%)';
+    }
+    return this;
+  };
+  /**
+   * Initialize.
+   * @returns {CustomJS}
+   */
+  this.init = () => {
+    this.RIP();
+    return this;
+  };
+})();
+
+/**
+ * Immediate.
+ */
+(() => {
+  CustomJS.init();
+  // It will be executed when the DOM tree is built.
+  document.addEventListener('DOMContentLoaded', () => {
+    // console.log('DOM content loaded!')
+  });
+})();