extjs TreeLoader 动态加载源码

Ext.onReady(function(){

var loader = new Ext.tree.TreeLoader({dataUrl:'../template/monitor.do?method=getMonitorTemplateTree'});

var root = new Ext.tree.AsyncTreeNode({
id : "0",
text : "监测器模板",
draggable : false
});

var tree = new Ext.tree.TreePanel({
renderTo : "tree",
height : 400,
width : 200,
loader : loader,
root : root,
draggable : false
});

loader.on('beforeload', function(loader, node){
this.baseParams.id = node.id;
}, loader);
});