diff --git a/ruoyi-admin/src/main/resources/static/ruoyi/js/common.js b/ruoyi-admin/src/main/resources/static/ruoyi/js/common.js
index e6b1fb97b..34aca2672 100644
--- a/ruoyi-admin/src/main/resources/static/ruoyi/js/common.js
+++ b/ruoyi-admin/src/main/resources/static/ruoyi/js/common.js
@@ -191,16 +191,8 @@ $(function() {
     'use strict';
     $.fn.toTop = function(opt) {
         var elem = this;
-        var win = $(window);
-        var doc = $('html, body');
-        if(typeof(opt) != "undefined"){
-        	if(opt.win != null){
-        		win = opt.win;
-        	}
-        	if(opt.doc != null){
-        		doc = opt.doc;
-        	}
-        }
+        var win = (opt && opt.hasOwnProperty('win')) ? opt.win : $(window);
+        var doc = (opt && opt.hasOwnProperty('doc')) ? opt.doc : $('html, body');
         var options = $.extend({
             autohide: true,
             offset: 50,