easyUI datagrid formatter获取数据

{field:'yxproduct',title:'产品',width:125,formatter: function (value,row,index) {
var htmlObj = $.ajax({
url : "../menu/yxcp",
type : "post",
async : false,
data : {id:row.yxproduct}
});
var text = htmlObj.responseText;
var json = JSON.parse(text);
return json.productname;
    }}