jQuery ajax调web service无法取得信息,解决就发分啦~解决办法

jQuery ajax调web service无法取得信息,解决就发分啦~~急
我如下这个js代码在Google chrome,IE9,firefox都没问题,可是在IE8下就取不到信息了.
 

JScript code

<script type="text/javascript">    function GetEQIDList(ModuleID)    {        $.ajax({            type:"POST",             contentType:"application/json",            url:"/FDCService/FDCService1.asmx/GetToolIDs",            data:"{moduleID:'"+ModuleID+"'}",            datatype:'json',            success:function(result){            try{                $('#toolList').empty();                $("#toolList").append("<option value='" + "All" + "'>" + "All" + "</option>");                     $(result.d).each(function() {                            $("#toolList").append("<option selected='selected' value='" + this + "'>" + this + "</option>");                        });                }catch(e){                    alert(e);                 }              },             error: function(result, status){                if(status=='error'){                    alert(result);                }             }        });      }</script> 

XML code

<?xml version="1.0" encoding="UTF-8"?>-<ArrayOfString xmlns="http://tempuri.org/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <string>ACCCUA01</string> <string>ACCCUA02</string> <string>ACCCWA01</string> <string>ACCOXA01</string> <string>ACCSTA01</string> </ArrayOfString>