运行的结果是第一个节点打开关不上，最后两个节点打不开，只有第二三个节点是好的
Extjs代码：
Ext.onReady(function(){
Ext.BLANK_IMAGE_URL="Extjs3.2.0/resources/images/default/s.gif";
var Tree = Ext.tree;
var tree = new Tree.TreePanel({
el:'west_content',//渲染到
useArrows:true,
autoHeight:true,
split:true,
lines:true,
autoScroll:true,
animate:true,
enableDD:true,
border:false,
containerScroll: true,
loader: new Tree.TreeLoader({
dataUrl:'GetTrees.ashx'
})
});
var root = new Tree.AsyncTreeNode({
text: '机型零部件菜单',
draggable:true,
id:'0'
});
tree.setRootNode(root);
tree.render();
root.expand();
var viewport = new Ext.Viewport({
layout:'border',
items:[{
region:'west',
id:'west',
title:'菜单导航',
split:true,
width: 200,
minSize: 200,
maxSize: 400,
collapsible: true,
margins:'60 0 2 2',
cmargins:'60 5 2 2',
layout:'fit',
layoutConfig:{ activeontop:true},
defaults: { bodyStyle: 'margin:0;padding:0;'},
items:
new Ext.TabPanel({
border:false,
activeTab:0,
tabPosition:'bottom',
items:[{
contentEl:'west_content',
title:'系统管理',
autoScroll:true,
bodyStyle:'padding:5px;'
}]
})
},{
region:'center',
el:'center',
deferredRender:false,
margins:'60 0 2 0',
html:'<iframe id="center-iframe" width="100%" height=100% name="main" frameborder="0" scrolling="auto" style="border:0px none; background-color:#BBBBBB; " ></iframe>',
autoScroll:true
},
{
region:'south',
margins:'0 0 0 2',
border:false,
html:'<div class="menu south">Copyright © 2010 Kimi Yang All Rights Reserved</div>'
}
]
});
setTimeout(function(){
Ext.get('loading').remove();
Ext.get('loading-mask').fadeOut({remove:true});
}, 250)
});
GetTrees.ashx：
namespace test4.web
{
/// <summary>
/// $codebehindclassname$ 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class GetTrees : IHttpHandler
{
public void ProcessRequest(HttpContext context)