ExtJS:向TreePanel中的节点添加单击操作

Ext.create('Ext.tree.Panel', {
    title: 'My Tree',
    width: 200,
    height: 150,
    store: Ext.create('Ext.data.TreeStore', {
        root: {
            text: 'Root',
            expanded: true,
            children: [
                { text: 'Child 1', leaf: true },
                { text: 'Child 2', leaf: true }
            ]
        }
    }),
    listeners: {
        itemclick: function(view, record, item, index, event, eOpts) {
            Ext.Msg.alert('Node Clicked', record.get('text'));
        }
    },
    renderTo: Ext.getBody()
});