jquery自动完成键值不显示从asmx返回的值

Question

我尝试通过asmx网络服务为自动填充字段设置键/值列表。

这是我返回jquery的数据：

> {   "419": "Alexander High School",   "370": "Alfred I. duPont Middle
> School",   "245": "Allatoona High School",   "120": "Allen D. Nease
> High School",   "365": "Alpharetta High School",   "232": "Andrew
> Jackson High School",   "371": "Apalachee High School" }

我创建数据的方式是：

[WebMethod(true)]
        public string GetSchoolList()
        {
            var schItem = new Dictionary<string, string>();

            var schools = UndercBLL.GetSchools().ToList();
            foreach (SchoolItem school in schools)
            {
                schItem.Add(school.Id.ToString(), school.Name);
            }

            var json = JsonConvert.SerializeObject(schItem, Formatting.Indented);
            return json;

        }

jquery部分设置如下：

$("#tags").autocomplete({
                source: function (request, response) {
                    $.ajax({
                        type: "POST",
                        url: "SchoolInfo.asmx/GetSchoolList",
                        contentType: "application/json; charset=utf-8",
                        dataType: 'json',
                        success: function (data) {
                            alert(data);
                            response($.map(data, function (value, key) {
                                return {
                                    label: value,
                                    value: key
                                };
                            }));
                        }
                    });
                },
                minLength: 2
            });

警告数据给了我

知道我做错了什么吗？我在萤火虫中没有收到任何错误，但正如您所看到的，我没有显示任何自动填充选项。