easyui 不分辨json

easyui 不识别json

<ul id="tt2"></ul>

$(function() {
    $('#tt2').tree({
        animate: true,
        url: 'data/test.ashx',
        onBeforeExpand: function(node, param) {
            $('#tt2').tree('options').url = "data/test.ashx";
        },               
        onClick:function(node){             
        alert(node.id); 
        } 

    })

后台代码

public void ProcessRequest(HttpContext context)
        {
            string str = "[{'id':1,'text':'Folder1','iconCls':'icon-ok','children':[{'id':2,'text':'File1','checked':true},{'id':3,'text':'Folder2','state':'open','children':[{'id':4,'text':'File2','attributes':{'p1':'value1','p2':'value2'},'checked':true,'iconCls':'icon-reload'},{'id':8,'text':'Folder3','state':'closed','children':[{'id':9,'text':'File31'},{'id':10,'text':'File32'}]}]}]},{'text':'Languages','state':'closed','children':[{'id':'j1','text':'Java'},{'id':'j2','text':'C#'}]}]";
            context.Response.ContentType = "text/plain";
            context.Response.Write(str);
            context.Response.End();
        }

但是页面无法显示，求助大神帮忙看一下
[解决办法]
改成下面标准json格式试试，应该jq版本为1.4+怪异模式的json导致没执行success回调，参考：jQuery dataType指定为json的问题

//string str = "[{'id':1,'text':'Folder1','iconCls':'icon-ok','children':[{'id':2,'text':'File1','checked':true},{'id':3,'text':'Folder2','state':'open','children':[{'id':4,'text':'File2','attributes':{'p1':'value1','p2':'value2'},'checked':true,'iconCls':'icon-reload'},{'id':8,'text':'Folder3','state':'closed','children':[{'id':9,'text':'File31'},{'id':10,'text':'File32'}]}]}]},{'text':'Languages','state':'closed','children':[{'id':'j1','text':'Java'},{'id':'j2','text':'C#'}]}]";
//===>
string str ="[{"id":1,"text":"Folder1","iconCls":"icon-ok","children":[{"id":2,"text":"File1","checked":true},{"id":3,"text":"Folder2","state":"open","children":[{"id":4,"text":"File2","attributes":{"p1":"value1","p2":"value2"},"checked":true,"iconCls":"icon-reload"},{"id":8,"text":"Folder3","state":"closed","children":[{"id":9,"text":"File31"},{"id":10,"text":"File32"}]}]}]},{"text":"Languages","state":"closed","children":[{"id":"j1","text":"Java"},{"id":"j2","text":"C#"}]}]";

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