总是找不到后台方法。

我的前台调用时这么写的

  <script type="text/javascript">
            function MyViewModel() {
                var self = this;
                self.items = ko.observableArray();
                self.add = function () {
                    console.log("sdfsd");
                };
                self.del = function(data) {
                    self.items.remove(data);
                    console.log(data.firstName);
                };
            }
            $(function () {
                var vm = new MyViewModel();
                $.ajax({
                    type: "get",
                    url: "/Test7.aspx/makedata",
                    success: function (datas) {
                     
                        });
                        ko.applyBindings(vm);
                    }
                });

            });

</script>

后台方法：

  [WebMethod]
        public void makedata()
        {
            
        }