public IActionResult StuLog(Student student)
        {
            LogMethod log = new LogMethod();
            Student   m   = log.StuLogin(student);

            if (m != null)
            {
                this.Response.Cookies.Append("Sno", m.Sno);
                return(RedirectToAction("Index", "Student"));
            }
            else
            {
                return(Content("<script>alert('登录失败,请检查账号或密码是否输入错误');history.go(-1);</script>", "text/html;charset=UTF-8"));
            }
        }