jquery when Deferred

window.Request = (function(){
	if(location.search.indexOf('?') == -1) return {};
	var req = {};
	location.search.substr(1).split('&').forEach(function(q){
		var qs = q.split('=');
        //相应的传入的uri，使用escape编码
		req[qs[0]] = unescape(qs[1]);
	});
	return req;
})();

var id = Request["MenuID"];
$("#MenuID").val(id || "0");

var a1 = $.getJSON('/sys/GetMenuCategory');
var a2 = null;
if (id) {
	a2 = $.getJSON('/sys/GetMenuById?id=' + id);
}
else {
    //这里用集合
	a2 = [{MenuID:0,ParentID:Request["ParentID"],Status:"True"}];
}

$.when(a1, a2).done(function (d1, d2) {
	d1 = d1[0];
	var dlCategory = $("#MenuCategory");
	$.each(d1, function (index, item) {
		dlCategory.append(new Option(item.CategoryName, item.Category));
	});

	d2 = d2[0];
	if(!id)
	{
		dlCategory.attr("disabled", true);
	}
	form.render();
	//checkbox 设为是否勾选 true|false
	d2.Status = d2.Status == "True";
	//layui 表单赋值
	form.val("layuiadmin-form-menuedit", d2);
});