[HttpPut]
        public JsonResult Update(Student student)
        {
            if (student == null)
                return Json("参数为空");
            return Json(bLL.Update(student));
        }

        [HttpDelete]
        public JsonResult Delete(dynamic[] ids)
        {
            if (ids.Length == 0)
                return Json("参数为空");
            return Json(bLL.Delete(ids));
        }