求助关于extjs中的store
我在前台用这种方式加载store但是不知道为什么不弹出数据，哪位高手指点下小弟啊？
Ext.onReady(function(){

var _store=new Ext.data.JsonStore({
url:'mygrid.jsp',
//data:[{name:'maomao',age:23,sex:'man'},{name:'nana',age:24,sex:'feman'}],
fields:['name','age','sex']
});

_store.on('load',function(_store){
alert(_store.getCount());
alert(Ext.util.JSON.encode(_store.getAt(0).data));
});
_store.load();
});

传如的json格式为：[{name:'maomao',age:23,sex:'man'},{name:'nana',age:24,sex:'feman'}]