/// <summary>

    /// ProductHandler 的摘要说明

    /// </summary>

    public class ProductHandler : IHttpHandler

    {



        public void ProcessRequest(HttpContext context)

        {

            context.Response.ContentType = "text/xml";

            string PCid = context.Request["ID"];

            DataSet ProClass = Business.BLL_Product.getProductClassByID(PCid);

          //  ProClass.WriteXml(context.Response.Output);

            context.Response.Write(ProClass.GetXml());

        }



        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

    }

 <script type="text/ecmascript">

       

        $(function () {

            $('a').click(function () {

                $('.children').css('display', 'none');

                $(this).next('.children').css('display', 'block');

                var Pid = $(this).attr('id');

                $.post("ProductHandler.ashx", { "ID": Pid }, function (xhr) {

                    var items = xhr.firstChild;

                    items = $(items);

                    var str = "";

                    for (var i = 0; i < items[0].childNodes.length; i++) {

                        var ID = $(items[0].childNodes[i]).find("ID").text();

                      &nbs