extjs formpanel修改时自动读取相同名字段

var editReader = new Ext.data.JsonReader({
            root: 'data'
        });

var updateform = new Ext.FormPanel({
            url: 'StaffAjax/StaffDegreeInforAjax.ashx',
            plain: true,
            reader: editReader,
            defaultType: 'textfield',
            items: [...]});
items里的 textfield ,combox的name的名与json里的字段名一样,如果不用name,id名与字段名一样也行
updateform.getForm().load({ url: "getDataAjax.ashx?type=getEditForm&ID=" + selections[0].data.ID });
读的json data:
{success:true,metaData:{root:"data",totalProperty:"totalCount",fields:["ID","ZGBH","XLM","SXZY","RXNY","XXXSM","XXFSM","XZ","BYNY","BYXX","XWM","XWSYRQ","XWSYGJM","XWSYDW"]},data:[{"ID":71,"ZGBH":6,"XLM":"DM-XLDM_2","SXZY":"复生","RXNY":"2010-10-07","XXXSM":"DM-XXXS_03","XXFSM":"DM-XXFS_3","XZ":"54","BYNY":"2010-10-27","BYXX":"快速","XWM":"DM-XWDM_209","XWSYRQ":"2010-10-09","XWSYGJM":"DM-SJGGDQ-528","XWSYDW":"顶端"}],totalCount:1}