Ext.data.proxy 中jsonp方式，获取数据的有关问题-菜鸟的有关问题

Ext.data.proxy 中jsonp方式，获取数据的问题---初学者的问题
Model:
Ext.define('ecms.view.message.messageindexmodel', {
extend: 'Ext.data.Model',
fields: [ 
{ name: 'source',  type:'string' },
{ name:'type', type:'string'  },
{ name:'title',  type:'string'  },
{ name:'url',type:'string'  }
]
});
Store:
Ext.define('ecms.view.message.messageindexstore', {
extend: 'Ext.data.Store',
model: 'ecms.view.message.messageindexmodel',
autoLoad: false,
remoteSort: true,
remoteFilter: true,
pageSize: 30,
autoSync: false,
sorters:[{
        property:'source',
        direction:'ASC'
    }],
proxy: {
 type: 'jsonp',
        url : 'http://localhost:4529/Messagemg/jss.js',
reader: {
type: 'json',
implicitIncludes:true,
record : 'info'
}

}
});
调用：
var me = this;
me.store = Ext.create('ecms.view.message.messageindexstore');
me.store.load({
     callback: function() {
     var user = me.store.first();
     alert(user);
     }
});
JS：
var info={"info":[{"source":"1","type":"系统公告","title":"dddddddd (2012-01-26)","url":"http://localhost:4529/Messagemg/message_edit_release.aspx?id=74"},{"source":"1","type":"系统公告","title":"dddddddd (2012-01-26)","url":"http://localhost:4529/Messagemg/message_edit_release.aspx?id=74"}]} 

跟踪请求已发出，就是读不出任何内容，显示为空
------最佳解决方案--------------------
在proxy的reader里没有定义root:

proxy: {

  type: 'jsonp',

  url : 'http://localhost:4529/Messagemg/jss.js',

  reader: {

    type: 'json',

    implicitIncludes:true,

    root : 'info'  //感觉问题可能在这里，试试把你的record 换成root

  }

}

------其他解决方案--------------------
数据格式错了，看红色部分，还需要用Response.Write输出info
 string cb = Request.Params.Get("cbackf");
string   info = "{\"success\":true,\"total\":2,\"info\":{[{\"source\":\"1\",\"type\":\"系统公告\",\"title\":\"dddddddd (2012-01-26)\",\"url\":\"http://localhost:4529/Messagemg/message_edit_release.aspx?id=74\"},{\"source\":\"1\",\"type\":\"系统公告\",\"title\":\"dddddddd (2012-01-26)\",\"url\":\"http://localhost:4529/Messagemg/message_edit_release.aspx?id=74\"}]}}";
 info = cb + "(" + info + ")";
Response.Write(info);
------其他解决方案--------------------
参考http://www.sencha.com/forum/showthread.php?155122-Proxy-not-working-with-type-jsonp-!!!

把JSON输出放到一个ASPX中
 String cb = Request.Params.Get("cbackf");
            info = "{\"success\":true,\"total\":2,\"info\":{[{\"source\":\"1\",\"type\":\"系统公告\",\"title\":\"dddddddd (2012-01-26)\",\"url\":\"http://localhost:4529/Messagemg/message_edit_release.aspx?id=74\"},{\"source\":\"1\",\"type\":\"系统公告\",\"title\":\"dddddddd (2012-01-26)\",\"url\":\"http://localhost:4529/Messagemg/message_edit_release.aspx?id=74\"}]}}";
 info = cb + "(" + info + ")";