aspx调用webmethod

 [WebMethod]
        public static string CheckLogin(string user, string pwd)
        {
            pwd = FormsAuthentication.HashPasswordForStoringInConfigFile(pwd, "md5");
            University.BLL.Student bll = new University.BLL.Student();
            DataSet ds = bll.Login(user, pwd);
            if (ds.Tables[0].Rows.Count > 0)
            {
                //login成功
                return "登陆成功。";              
            }
            else
            {
                //login失败
                return "登陆失败。";
            }
        }

　　

 $("#login").click(function () {
                $.ajax({
                    type: "Post",
                    url: "index_Student.aspx/CheckLogin",
                    data: "{ 'user': '" + $("#user").val() + "', 'pwd':'" + $("#pwd").val() + "'}",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (data) {
                        //返回的数据用data.d获取内容   
                        alert(data.d);
                    },
                    error: function (err) {
                        alert(err);
                    }
                });
                return false;

            });