function addTab(title, url, isclosable) {
    if ($('#tabs').tabs('exists', title)) {
        $('#tabs').tabs('select', title); //选中并刷新
        var currTab = $('#tabs').tabs('getSelected');
        var url = $(currTab.panel('options').content).attr('src');
        if (url != undefined && currTab.panel('options').title != 'Home') {
            $('#tabs').tabs('update', {
                tab: currTab,
                options: {
                    content: createFrame(url)
                }
            })
        }
    } else {
        var content = createFrame(url);
        $('#tabs').tabs('add', {
            title: title,
            content: content,
            closable: isclosable
        });
    }
    tabClose();
}
function createFrame(url) {
    alert(url);
    var s = '<iframe scrolling="auto" frameborder="0"  src="' + url + '" style="width:100%;height:100%;"></iframe>';
    return s;
}