.net extjs3.2（new Ext.data.JsonStore）数据出错

.net extjs3.2（new Ext.data.JsonStore）数据报错




<!DOCTYPE html>


<html xmlns="http://www.w3.org/1999/xhtml">

<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>


</title>


<link href="/css/main.css" rel="stylesheet" />

<script src="/Scripts/jquery-1.8.2.min.js"></script>

<link href="/Scripts/extjs/ext3/resources/css/ext-all.css" rel="stylesheet" />

<link href="/Scripts/extjs/ext3/resources/css/ext-patch.css" rel="stylesheet" />

<link href="/Scripts/extjs/css/admin.css" rel="stylesheet" />

<script src="/Scripts/extjs/ext3/adapter/ext/ext-base.js"></script>

<script src="/Scripts/extjs/ext3/ext-all.js"></script>

<script src="/Scripts/extjs/ext3/ext-lang-zh_CN.js"></script>

<script>

    Ext.BLANK_IMAGE_URL = "/Scripts/extjs/ext3/resources/images/default/s.gif";

    Ext.Ajax.timeout = 3600000; //一小时超时


    var localObj = window.location;

    var contextPath = localObj.pathname.split("/")[1];

    var basePath = localObj.protocol + "//" + localObj.host + "/" + contextPath;

</script>

<script>


    Ext.onReady(function () {




        //创建一个数据源来查询功能信息

        var ds = new Ext.data.JsonStore({

            autoLoad: true,

            baseParams: { start: 1, limit: 15 },

            root: 'datas',

            totalProperty: 'totalCount',

            proxy: new Ext.data.HttpProxy({

                url: 'ViewBussiness/AjaxDone/UserDone.aspx',//请求的url地址

                method: 'POST'

            }),

            fields: ['MENU_ID', 'PARENT_ID', 'XH'],

                    listeners: {

                        exception: function () {

                            Ext.Msg.alert("错误", "数据加载出错！");

                        }

                    }

        });



        //定义一个列表显示查询出的数据

        var queryList = new Ext.grid.GridPanel({

            id: 'pgrid',

            title: '功能菜单',

            region: 'center',

            store: ds,

            selectedRowNumber: 0,

            stripeRows: true,

            border: false,

            enableColumnMove: false,

            enableHdMenu: true,

            loadMask: { msg: '正在查询数据,请稍候......' },

            viewConfig: {

                //True表示为自动展开/缩小列的宽度以适应grid的宽度，这样就不会出现水平的滚动条

                forceFit: true,

                scrollOffset: 0

            },

            cm: new Ext.grid.ColumnModel({// table框中表格

                columns: [

                              { header: "", dataIndex: "MENU_ID", hidden: true },

                              { header: "", dataIndex: "PARENT_ID", hidden: true },

                              { header: '序号', dataIndex: "XH", align: 'center', width: 30, sortable: true },


                ],

                defaultSortable: false

            }),

            bbar: [new Ext.PagingToolbar({

                store: ds,

                pageSize: 15,

                displayInfo: true,

                emptyMsg: '未查询到记录',

                doLoad: function (start) {

                    record_start = start;

                    var o = {}, pn = this.getParams();

                    o[pn.start] = start;

                    o[pn.limit] = this.pageSize;

                    this.store.load({ params: o });

                }

            })]

        });


        // 页面布局

        var nsrLayout = new Ext.Viewport({

            layout: 'border',

            border: false,

            items: [{

                region: 'center',

                border: false,

                layout: 'border',

                items: [queryList]

            }]

        });


    });






</script>

</head>

<body>


</body>

</html>

后台代码：




        protected void Page_Load(object sender, EventArgs e)

        {

            string txt = "{\"totalCount\":\"10\",\"datas\":[{\"MENU_ID\":\"c82\",\"PARENT_ID\":\"b\",\"XH\":\"0\"}]}";

            Response.Write(txt);

        }

怎么都显示出不来数据（还报错：数据错误），关键是不会 extjs
------解决思路----------------------
使用firebug调试下!

.net extjs3.2（new Ext.data.JsonStore）数据出错

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