Javascript EXTJS JsOnStore位,但显示空值

Javascript EXTJS JsOnStore位,但显示空值,javascript,json,extjs,Javascript,Json,Extjs,这是一张带有\u0001的显示关机返回值的图片,但不幸的是,当我在JsOnStore中存储失败并且我试图将alert('PowerOff')设置为空时,为什么 这是我的JsOnStore模型数据 Ext.define('GoogleMarkerModel', { extend: 'Ext.data.Model', fields: [ {name: 'ID', type: 'int'}, {name: 'Locating',

这是一张带有\u0001的显示关机返回值的图片,但不幸的是,当我在JsOnStore中存储失败并且我试图将
alert('PowerOff')
设置为空时,为什么

这是我的JsOnStore模型数据

Ext.define('GoogleMarkerModel', {
        extend: 'Ext.data.Model',
        fields: [
        {name: 'ID',    type: 'int'},
        {name: 'Locating',    type: 'int'},
        {name: 'MainPower',    type: 'int'},
        {name: 'Acc',    type: 'int'},
        {name: 'PowerOff',    type: 'int'}, // i have tried int,string,bit
        {name: 'Alarm',    type: 'int'},
        {name: 'Speed',    type: 'int'},
        {name: 'Direction',    type: 'int'},
        {name: 'Latitude',    type: 'float'},
        {name: 'Longitude',    type: 'float'},
        {name: 'DateTime',    type: 'datetime'},
        {name: 'MainID',    type: 'int'},
        {name: 'IOState',    type: 'int'},
        {name: 'OilState',    type: 'int'},
        {name: 'PicUploadedDateTime',    type: 'datetime'},
        {name: 'PicData',    type: 'str'}
        ]
    });

PicData类型应该是
string
而不是
str
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