update

js/Desktop/DeskTop.js

@@ -6970,7 +6970,7 @@ U.MD.D.I.openApplicationJieTeacher = function (str, cid, stage, task, tool, stud
             if (onloadListener) {
                 try {
                     _iframe.src += ""
-                    _iframe.contentDocument.location.reload()
+                    _iframe.contentWindow.document.location.reload()
                 } catch (error) {
                 }
             } else {