function addTab(title, href,icon){    var tt = $('#tabs');    if (tt.tabs('exists', title)){
   //如果tab已经存在,则选中并刷新该tab                tt.tabs('select', title);        refreshTab({tabTitle:title,url:href});    } else {        if (href){            var content = '';        } else {            var content = '未实现';        }        tt.tabs('add',{            title:title,            closable:true,            content:content,            iconCls:icon||'icon-default'        });    }}/**     * 刷新tab * @cfg  *example: {tabTitle:'tabTitle',url:'refreshUrl'} *如果tabTitle为空，则默认刷新当前选中的tab *如果url为空，则默认以原来的url进行reload */function refreshTab(cfg){    var refresh_tab = cfg.tabTitle?$('#tabs').tabs('getTab',cfg.tabTitle):$('#tabs').tabs('getSelected');    if(refresh_tab && refresh_tab.find('iframe').length > 0){    var _refresh_ifram = refresh_tab.find('iframe')[0];    var refresh_url = cfg.url?cfg.url:_refresh_ifram.src;    //_refresh_ifram.src = refresh_url;    _refresh_ifram.contentWindow.location.href=refresh_url;    }}