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 = ; 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>