easyui combobox默认选中项

今天写前端代码发现combobox还挺难搞，

$("#select_Dic").combobox({

url: "/Ajax/sys/WebServiceBase.ashx?Method=GetRefItems", //获取所有私有域

valueField: "Code",

textField: "Name",

panelHeight: "auto",

editable: false, //不允许手动输入

onLoadSuccess: function () { //数据加载完毕事件

var data = $('#select_Dic').combobox('getData');

if (data.length > 0) {

$("#select_Dic").combobox('select', data[0].value);

}

}

});