问jquery ajax在RESTful ajax服务上不返回任何传输

EN

$.ajax({
            type: 'GET',
            url: WEBSERVICE_URL + 'getWebFormDesignFieldContents',
            data: JSON.stringify({
                'pr_id': LOGGED_IN_PR_ID,
                'fe_name': opts,
                '_count': 200,  //this might need to be adjusted slightly.  I may want to make it more OR less.
                '_also_search_fe_desc': true,
                'opts': opts
            }),
            contentType: 'application/json; charset=utf-8',
            dataType: 'jsonp',
            success: function (result) {
                //success
                var r = $(result.getWebFormDesignFieldContentsResult)[0];
                var div = $("<div class='modal'>").html(r.d);
                /*
                var d = document.createElement("div");
                d.className = "modal";
                d.appendChild(r[0]);
                */
                $("div.modal").replaceWith(div);
                $("div.modal #queryInput").val(opts);
                $("div.modal").css({
                    top: $(window).height() / 2 - $("div.modal").height() / 2,
                    left: $(window).width() / 2 - $("div.modal").width() / 2
                });
                $("div.modal").fadeIn();
            },
            error: function (result) {
                //error
                //alert("Error: "+result.statusText);
                alert(result.statusText);

                //$("div.modal").replaceWith($("<div class = 'modal'>").html(result.responseText));
                //$("div.modal").fadeIn();
                $("div.overlay").fadeOut();
            }
        });

[OperationContract]
    [WebInvoke(Method = "POST",
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Wrapped,
        UriTemplate = "getWebFormDesignFieldContents")]
    string getWebFormDesignFieldContents(WebFormFieldClass inputData);

public string getWebFormDesignFieldContents(string pr_id, string fe_name, string _count, string _also_search_fe_desc, string opts)
    {
       int count = Convert.ToInt32(_count);
       bool also_search_fe_desc = Convert.ToBoolean(_also_search_fe_desc);
       ...
    }

 [DataContract]
public class WebFormFieldClass
{
    [DataMember]
    public string pr_id { get; set; }
    [DataMember]
    public string fe_name { get; set; }
    [DataMember]
    public int count { get; set; }
    [DataMember]
    public string also_search_fe_desc { get; set; }
    [DataMember]
    public string opts { get; set; }
}