asp.net中ajax进不去ashx，求大神回解决

asp.net中ajax进不去ashx，求大神来解决
求大神来解答下。。这ajax，死活就是不仅ashx页面去。不管我是话data的方式，还是注释掉。 。在ashx加了断点，反正就是不进去。什么原因

 $("#btnSubmit").click(function() {

                var divpro = $("#divpro");

                var progressbar = $("#progressbar");

                var progressLabel = $(".progress-label");

                var starttime = $("#txtstartime").val();

                var endtime = $("#txtendtime").val();

                var type = $("#ddlDataList").val();

                //divpro.attr("display", "block");

                progressbar.progressbar({

                    value: false,

                    change: function() {

                        progressLabel.text(progressbar.progressbar("value") + "%");

                    },

                    complete: function() {

                        progressLabel.text("完成!");

                    }

                });

                getdata();

                function getdata() {

                    $.ajax({

                        //要用post方式

                        type: "POST",

                        anync: true,

                        //方法所在页面和方法名

                        url: "synlogdata.ashx",

                        cache: false,

                        //contentType: "application/json; charset=utf-8",

                        //data: "{ 'starttime':'" + starttime + "', 'endtime':'" + endtime + "', 'type':'" + type + "' }", //"starttime=" + starttime + "&endtime=" + endtime + "&type=" + type,

                        dataType: "json",

                        success: function(data) {

                            //返回的数据用data.d获取内容

                            num = data.d;

                            val = parseFloat(num);

                            progressbar.progressbar("value", val);

                            if (val >= 100) {

                                clearInterval(sh);