diff --git a/WebIDE/enhance.user.js b/WebIDE/enhance.user.js
index e8befd4..f54b3a8 100644
--- a/WebIDE/enhance.user.js
+++ b/WebIDE/enhance.user.js
@@ -13,7 +13,7 @@
     'use strict';
     var id = setInterval(function (){
         if (document.getElementsByClassName('ide-container')[0]) {
-            document.onbeforeunload = function () { return false; }
+            window.onbeforeunload = function () { return false; }
             console.log('已阻止 Ctrl + W 关闭页面...')
             clearInterval(id);
         }