Extjs获取不到后台回传的json数据
前台Extjs代码:

Ext.onReady(function () {

var store = new Ext.data.Store({
proxy: new Ext.data.HttpProxy({ url: "/WebService/test/tb_data.ashx" }),
reader: new Ext.data.JsonReader({
totalProperty: "results",
root: "jsonObjs"
},
[
{ name: 'user_name' },
{ name: 'user_id' },
{ name: 'ssyj' }
]
),
listeners: {
load: function () {
alert(store.getCount());
}
}
});

store.load();

});

后台代码:

public void ProcessRequest(HttpContext context)
{
context.Request.ContentEncoding = Encoding.GetEncoding("UTF-8");

context.Response.ContentEncoding = Encoding.GetEncoding("UTF-8");

context.Response.Charset = "UTF-8";

context.Response.ContentType = "text/plain";

string result = string.Empty;

string ygk_list = string.Empty;

string strSQL = string.Empty;

try
{
strSQL = string.Format(@"select tb_user.user_name,tb_fwcjqr.user_id,sum(tb_fwcjqr.htzj)as ssyj from tb_fwcjqr
inner join tb_user on tb_user.id = tb_fwcjqr.user_id
group by tb_user.user_name ,tb_fwcjqr.user_id");

DataTable dt = LTP.DBUtility.DbHelperSQL.Query(strSQL).Tables[0];

if (dt.Rows.Count > 0)
{
result = LTP.BLL.Ext_Json.DataTable2Json(dt);
}
else
{
result = "false";
}

}
catch
{
result = "error";
}

context.Response.Write(result);
}

返回的json字符串如下:
{"results":3,"jsonObjs":["user_name":"郑正英","user_id":"10","ssyj":"39569.0100"},"user_name":"王雪梅","user_id":"11","ssyj":"557619.9900"},"user_name":"张丹青","user_id":"12","ssyj":"116000.0000"},"user_name":"张海东","user_id":"13","ssyj":"1412742.9900"}]}

究竟是那里错了生成不了store数据.搞都我头都疼了.
[解决办法]

            store = new Ext.data.Store({
                proxy: new Ext.data.HttpProxy({
                    url: "/WebService/test/tb_data.ashx",
                    reader: new Ext.data.JsonReader({ totalProperty: "results", root: "jsonObjs" })////reader配置是proxy的，不是store的
                }),
                fields: [{ name: 'user_name' }, { name: 'user_id' }, { name: 'ssyj'}], 
 
                listeners: {
                    load: function () {
                        alert(store.getCount());
                    }
                }
            });