如何解决jQuery EasyUI 已打开Tab重新加载问题

function addTab(subtitle, url) {     if (!$('#tabs').tabs('exists', subtitle)) {       $('#tabs').tabs('add', {         title : subtitle,         content :<span style="font-family: Arial, Helvetica, sans-serif;">createFrame(url)</span><span style="font-family: Arial, Helvetica, sans-serif;">,</span>         border : false,         bodyCls:"indexTabBody",         closable : true       });     } else {       $("#tabs").tabs("select", subtitle);       var selTab = $('#tabs').tabs('getSelected');       $('#tabs').tabs('<strong>update</strong>', {         tab: selTab,         options: {           content:createFrame(url)         }       })     }   }   function createFrame(url){     return '<iframe scrolling="auto" frameborder="0" src="' +_ctx_+ url + '" style="width:100%;height:100%;"></iframe>';   }