diff --git a/js/demo.js b/js/demo.js
index acb7968..f73609f 100644
--- a/js/demo.js
+++ b/js/demo.js
@@ -4,7 +4,7 @@
  * @Github: 
  * @Date: 2019-12-11 09:17:17
  * @LastEditors: tangjiang
- * @LastEditTime: 2019-12-11 11:53:57
+ * @LastEditTime: 2019-12-11 11:55:53
  */
 $(document).ready(function () {
   $('#btn').on('click', function () {
@@ -52,10 +52,10 @@ $(document).ready(function () {
       // $('.collpase-icon').remove('icon-shouqi').add('icon-zhankai');
     }
 
-    if ($(this).hasClass('icon-zhankai')) {
-      $(this).removeClass('icon-zhankai').addClass('icon-shouqi')
+    if ($('.collpase-icon').hasClass('icon-zhankai')) {
+      $('.collpase-icon').removeClass('icon-zhankai').addClass('icon-shouqi')
     } else {
-      $(this).removeClass('icon-shouqi').addClass('icon-zhankai')
+      $('.collpase-icon').removeClass('icon-shouqi').addClass('icon-zhankai')
     }
   }
   // 收缩左侧侧边栏