extjs 获取store为空问题

var states = Ext.create('Ext.data.Store', { //[{name:'lineId'},{name: 'id'}]
 autoLoad: true,
fields: [{name:name},{name: 'id'}],
proxy: {
type: 'ajax',
url : getLineOrSubJson,
reader: {
type: 'json'
}
}
});
　　

　　然后获取store时总是为空，应该是异步加载时机问题，懒得追问，想在下面的代码中读取store中数据，可以修改下

var states = Ext.create('Ext.data.Store', { //[{name:'lineId'},{name: 'id'}]
// autoLoad: true,
fields: [{name:name},{name: 'id'}],
proxy: {
type: 'ajax',
url : getLineOrSubJson,
reader: {
type: 'json'
},
sync : true 
}
});



states.on("load",function(){ 
   //you can get store here..
}
}); 
states.load();