ExtJS的读取JSON数据读不到

明明数据是正确的，但是为什么不显示呢
这是Extjs代码

var proxy=new Ext.data.HttpProxy( {url:'common/app/view/survey.json'});
//定义reader
var reader=new Ext.data.JsonReader(
{
},[
{name: 'appeId', mapping: 'appeId'},
{name: 'survId'},
{name: 'location'},
{name: 'surveyDate'},
{name: 'surveyTime'},
{name: 'inputUserId'}
]
)
//构建Store
var store=new Ext.data.Store( {
proxy:proxy
,reader:reader
});
//载入
store.load();

// create the grid

var grid = Ext.define('App.view.HomeData', {
extend : 'Ext.grid.GridPanel',
alias : 'widget.HomeData',

store: store,
columns: [
{header: "appeId", width: 60, dataIndex: 'appeId', sortable: true},
{header: "survId", width: 60, dataIndex: 'survId', sortable: true},
{header: "location", width: 60, dataIndex: 'location', sortable: true},
{header: "surveyDate", width: 100, dataIndex: 'surveyDate', sortable: true},
{header: "surveyTime", width: 100, dataIndex: 'surveyTime', sortable: true},
{header: "inputUserId", width:80, dataIndex: 'inputUserId', sortable: true}
],

width:1000,
height:400
});

还有JSON数据
[{"appeId":"1","survId":"1","location":"","surveyDate":"2008-03-14","surveyTime":"12:19:47","inputUserId":"1","inputTime":"2008-03-14 12:21:51","modifyTime":"0000-00-00 00:00:00"}]

第一、查看你的json是否正确
第二、我的写法，请参考
var itemsPerPage = 50;
var store = Ext.create('Ext.data.Store', {
autoLoad: { start: 0, limit: itemsPerPage },
fields: ['ZWWLDW_DWBH', 'ZWWLDW_DWMC', 'ZWWLDW_DWMM', 'ZWWLDW_DWQX', 'ZWWLDW_DWBZ'],
pageSize: itemsPerPage,
proxy: {
type: 'ajax',
url: 'HandlerFun.ashx?Type=CMManager',
reader: {
type: 'json',
root: 'rows',
totalProperty: 'total'
}
}

});

如果放我这个还不行，等一下，我把grid那里也发给你，这个都是项目中的

ext.ajax.request({ url:basepath + ’public/getcurdate.action‘, success:function(response, options) { var e = ext.util.json.decode(response.responsetext.trim()); //其中数据这样调用 e.curaccuratedatestr = '2012-12-25 18:17:44' } })