Ajax调用asp.net后台代码

后台代码：

[WebMethod]
        public static string CreateDate(string name,string age)
        {
            return "姓名："+name +"年龄："+ age;
        }

        [WebMethod]
        public static string CreateInfo()
        {
            return "调用成功";
        }

        [WebMethod]
        public static List<string> CreateString(string num)
        {
            List<string> list = new List<string>();
            for (int i = 0; i < Convert.ToInt32(num); i++)
            {
                list.Add(i+",");
            }
            return list;
        }

前台代码：

</div>
        <input type="button" id="btn" value="点击调用后台无参方法" />
        <input type="button" id="btn1" value="点击调用后台有参方法" />
        <input type="button" id="btn2" value="点击调用后台返回集合的方法" />
    </form>

    <script>

        $(function () {
            $("#btn").click(function () {
                $.ajax({
                    type:"Post",
                    url: "index1.aspx/CreateInfo",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    data: "",
                    success: function (data) {
                        alert(data.d);
                    },
                    error:function(err){
                        alert("调用失败")
                    }
                });
            });

            $(function () {
                $("#btn1").click(function () {
                    $.ajax({
                        type: "Post",
                        url: "index1.aspx/CreateDate",
                        contentType: "application/json; charset=utf-8",
                        dataType: "json",
                        data: "{'name':'符越涵','age':'25'}",
                        success: function (good) { alert(good.d) },
                        error: function (err) { alert("调用错误") }
                    });
                });
            });

            $("#btn2").click(function () {
                $.ajax({
                    type: "Post",
                    url: "index1.aspx/CreateString",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    data:"{'num':'50'}",
                    success: function (data) {
                        $(data.d).each(function () {
                            alert(this)
                        });
                    },
                    error: function (err) {alert("调用错误") }
                });
            });
        });
    </script>