c#中$.ajax的使用

<script type="text/javascript">

 var telphone = { type: "getphone", "num": dianhua, "typestr": index };
                $.ajax({
                    type: 'POST',
                    url: '/webService/GetMobile.ashx',
                    data: telphone,
                    dataType: 'text',
                    success: (function (data) {
                        if (data == "ok") {
                            alert("提交成功！");
                            $(".storesContents_Box1:eq(" + index + ") .txtmobile").val("");
                            $(".storesContents_Box1:eq(" + index + ") .txtmobile").focus();
                        }
                        else {
                            alert("提交失败！");
                        }
                    })
</script>
后台 GetMobile.ashx'

 public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";

        var type = context.Request.Params["type"];
        var telphoneNumber = context.Request.Params["num"];
        if (!string.IsNullOrEmpty(telphoneNumber))
        {  
            using(EF db = new EF())
            {
                Telphone xTelphone = new Telphone();
                xTelphone.Telphone = telphoneNumber;
                db.Telphone.AddObject(xTelphone);
                db.SaveChanges();
            }
        }
        switch (type)
        {
            case "getphone":
                {
                    context.Response.Write("ok");
                    break;
                }
        }
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }