$.ajax({
            type: 'post', cache: false, dataType: 'json',
            url: 'WebHandler/User.ashx',
            data: [
                    { name: 'Action', value: 'name' }
                    ],
            success: function (result) {
                if (result !== "") {
                    alert(result);//result的结果永远是[object]
                }
            },
            error: function () {
            },
            beforeSend: function () {
            },
            complete: function () {
            }
        });

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
                string terms = context.Request.Params["Action"];
                switch (terms)//得到传的值为 name
                {
                    case "id":
                        context.Response.Write(yjCookie.GetUce.Id);
                        break;
                    case "name":
                        context.Response.Write(yjCookie.GetUce.Name);//调试发现传的值为“测试用户”
                        break;
                    default:
                        context.Response.Write("");
                        break;
                }
            context.Response.End();
        }