update

js/Desktop/DeskTop.js

@@ -6653,7 +6653,7 @@ U.MD.D.I.openApplicationJieTeacher = function (str, cid, stage, task, tool, stud
                 "style": {
                     "cssText": "border:0;width:100%;height:100%"
                 },
-                "src": "https://beta.iwb.cocorobo.cn/"
+                "src": "https://beta.iwb.cocorobo.cn?cocorobo="+new Date().getTime()
             })
             _box.appendChild(_iframe);
             _box.appendChild(_jie);