jquery Ajax在本地程序运行正常，发布到IIS Ajax无返回值，求高手解答

function secondLoadAjax(allTime){

         $.ajax({         

                 url:"SearchSecondInfo",

                  datatype:"json",

                  data:"startTime=" + allTime,

                   success:function(sucText){

                    $("#ProjectTwiceSearchTable").empty();

                    $("#ProjectTwiceSearchTable").append("<tr bgcolor='#F1F1EF'><td width='11%' rowspan='2'> </td><td width='20%' rowspan='2' align='center' bgcolor='#F1F1EF'>二手房面积<br />(平方米)</td><td colspan='2' align='center' bgcolor='#F1F1EF'>其中：二手住宅  </td><td width='20%' rowspan='2' align='center' bgcolor='#F1F1EF'>二手住宅平均每套面积<br />(平方米/套)</td></tr><tr bgcolor='#F1F1EF'><td width='13%' align='center' bgcolor='#F1F1EF'>套数(套)</td><td width='20%' align='center' bgcolor='#F1F1EF'>面积(平方米)</td></tr>");

                    

                    var json = eval("("+sucText+")");

                    if(json.length <= 0){

                       $("#ProjectTwiceSearchTable").append("<tr><td colspan='5'>暂无数据</td></tr>");

                    }else{

                     for(var i = 0;i < json.length; i++){

                        $("#ProjectTwiceSearchTable").append("<tr bgcolor='#FFFFFF'><td align='center' bgcolor='#FFFFFF'>"+json[i].District+"</td><td align='center' bgcolor='#FFFFFF'>"+json[i].CommodityArea+"</td> <td align='center' bgcolor='#FFFFFF'>"+json[i].HouseCount+"</td><td align='center' bgcolor='#FFFFFF'>"+json[i].HouseArea+"</td> <td>"+json[i].HouseAvg+"</td>"); 

                       }

                    }

                   },

                   error:function(errorText){

                    alert("请求超时，请稍后重试!");

                   }



              });

         }

TodaySecondSellingBll tsbll = BllFactory.CreateTodaySecondSellingBll();

        string startTime = context.Request["startTime"];

        DataTable dt = tsbll.FindBetweenTime(startTime);

        IList<TodaySecondSelling> list = new List<TodaySecondSelling>();

        foreach (DataRow item in dt.Rows)

        {

            TodaySecondSelling to = new TodaySecondSelling();

            to.Id = Convert.ToInt32(item.ItemArray[0]);

            to.District = item.ItemArray[2].ToString();

            to.CommodityArea = Convert.ToDouble(item.ItemArray[3]);

            to.HouseCount = Convert.ToInt32(item.ItemArray[4]);

            to.HouseArea = Convert.ToDouble(item.ItemArray[5]);

            to.HouseAvg = int.Parse(item.ItemArray[7].ToString().Substring(0, item.ItemArray[7].ToString().LastIndexOf(".")));



            list.Add(to);

        }

        JavaScriptSerializer s = new JavaScriptSerializer();

        context.Response.Write(s.Serialize(list));