Ext采用viewport布局，怎么设置树的超链接？

Question

下面这段代码用了viewport布局，在west那块我加了个树形菜单，现在要实现单击树的节点，在center块中显示不同页面，可是用了hrefTarget好像不管用，都是新打开一个窗口，大家帮我看看哪里有问题...
<script type="text/javascript"> 
 Ext.onReady(function(){ 
    var root=new Ext.tree.TreeNode({
id:'root',
text:'点餐系统'});
var node1=new Ext.tree.TreeNode({text:'桌台信息维护',href:'table_list.html',hrefTarget:'mainFrame'});
var node2=new Ext.tree.TreeNode({text:'菜品信息维护',href:'vegetable_list.html',hrefTarget:'mainFrame'});

root.appendChild(node1);
root.appendChild(node2);
var tree=new Ext.tree.TreePanel({
   animate:true,
       rootVisible:true,
       autoScroll:true,
       autoHeight:true,
       useArrows:true,
   root:root,
   autoHeight:true
});new Ext.Viewport({
    layout: 'border',
    items: [
{
    frame:true,
    title:"点餐系统",
region:"west",
items:tree,
width:200,
collapsible:true,
split:true
},{  
                  region:'center',
id:'mainFrame',
autoScroll:true,
collapsible: true
    },{ 
        region: 'north',
frame:true,
contentEl:headdiv,
        split: true,
        height: 100,
        minHeight: 100
    }]
});});  </script> 

Answer 1

一个成功的例子 Ext.Loader.setConfig({ enabled: true });
        Ext.Loader.setPath('Ext.ux', '../../Scripts/ext-4.0/ext-4.0/examples/ux');
        Ext.require([
        'Ext.tree.*',
        'Ext.data.*',
        'Ext.window.MessageBox',
'Ext.form.Panel'
]);
        Ext.onReady(function() {            /** 
            * 上,panel.Panel 
            */
            this.topPanel = Ext.create('Ext.panel.Panel', {
                region: 'north',
                id: 'north',
                html: '<div style="background-image:url(../../Content/images/logo3.gif); background-repeat:no-repeat;" id="north" class="clearfix"><div class="title" ></div><div class="welcome">欢迎你!<span class="user"><%= ViewData["CurrentUser"]%></span><a href="/User/Logoff" class="logoff">注销</a></div></div>',
                height: 45,
                margins: '0 0 0 0',
                border: false
            });            /** 
            * 左,panel.Panel 
            */
            this.leftPanel = Ext.create('Ext.panel.Panel', {
                region: 'west',
                title: '导航栏',
                layout: 'accordion',
                collapseMode: 'mini',
                collapsible: true,
                width: 180,
                minWidth: 100,
                maxWidth: 300,
                split: true,
                autoScroll: true
            });            /** 
            * 右,tab.Panel 
            */
            this.rightPanel = Ext.create('Ext.tab.Panel', {
                region: 'center',
                id: 'tab',
                height: '100%',
                activeTab: 0,
                items: [
                {
                    title: '首页',
                    bodyPadding: 10
                }
                ]
            });            this.southPanel = Ext.create('Ext.panel.Panel', {
                region: 'south',
                html: '<div id="south"> Powered by ASP.Net MVC 2.0 + ExtJS 4.0.0 <a target="_blank" href="http://www.minstars.cn" style="text-decoration: none; color: #FFF;"></a></div>',
                split: true,
                margins: '0 0 0 0',
                border: false
            });            /** 
            * 组建树 
            */
            var buildTree = function(json) {
                return Ext.create('Ext.tree.Panel', {
                    rootVisible: false, /////////////////
                    border: false,
                    store: Ext.create('Ext.data.TreeStore', {
                        root: {
                            expanded: true,
                            children: json.children
                        }
                    }),
                    listeners: {
                        'itemclick': function(view, record, item,
                                        index, e) {
                            var id = record.get('id');
                            var text = record.get('text');
                            var leaf = record.get('leaf');
                            var tabPanel = Ext.getCmp('tab');
                            var tab = tabPanel.getComponent(id + "");
                            if (leaf) {
                                if (!tab) {
                                    tabPanel.add({
                                        id: id,
                                        title: text,
                                        closable: true,
                                        layout: 'fit',
                                        items: [{
                                            html: '<iframe id="itemPanel" name="itemPanel" frameborder=0 src="' + record.raw.url + '"  style="width:100%;height:100%;" scrolling=no></iframe>'
}]
                                        }).show();
                                    }
                                    tabPanel.setActiveTab(tab); //设置显示当前面板
                                }
                            },
                            scope: this
                        }
                    });
                };                /** 
                * 加载菜单树 
                */
                Ext.Ajax.request({
                    url: '<%= Url.Action("TreeMenu", "Home")%>',
                    success: function(response) {
                        var json = Ext.JSON.decode("{data:" + response.responseText + "}");
                        Ext.each(json.data, function(el) {                            var panel = Ext.create(
                                                'Ext.panel.Panel', {
                                                    id: el.id,
                                                    title: el.text,
                                                    layout: 'fit'
                                                });
                            panel.add(buildTree(el));                            leftPanel.add(panel);
                        });
                    },
                    failure: function(request) {
                        Ext.MessageBox.show({
                            title: '操作提示',
                            msg: "连接服务器失败",
                            buttons: Ext.MessageBox.OK,
                            icon: Ext.MessageBox.ERROR
                        });
                    },
                    method: 'post'
                });                /** 
                * Viewport 
                */
                Ext.create('Ext.container.Viewport', {
                    layout: 'border',
                    renderTo: Ext.getBody(),
                    items: [this.topPanel, this.leftPanel, this.rightPanel, this.southPanel]
                });            });

Answer 2

var node1=new Ext.tree.TreeNode({text:'桌台信息维护',href:'table_list.html',hrefTarget:'mainFrame'});
var node2=new Ext.tree.TreeNode({text:'菜品信息维护',href:'vegetable_list.html',hrefTarget:'mainFrame'});把href改成url就好了