Ext 动态加载树

var leftTree=new Ext.tree.TreePanel({
id:"lefttree",
title:"左侧树"，
loader:new Ext.tree.TreeLoader({

//这样写会自动创建一个treeloader
//dataUrl:"",

listeners:{

'beforeload':function(loader,node){

this.baseparams.text=node.attributes.text;

}

}
}),
root:new Ext.tree.AsyncTreeNode({
id:"root",
text:"根节点",
expanded:true,
leaf:false
})，
autoScroll:true,
rootVisible:true,
collapsible:true
});

 

要求数据源返回：

[{id:"1",text:"测试节点",leaft:false},{id:"2"}]