public async Task <dynamic> OnRemoveHomeworkAsync([FromForm] int hwID, [FromForm] string token)
        {
            try
            {
                var t = await tokenService.GetTokenAsync(token);

                if (t == null)
                {
                    throw new Exception("请先登录");
                }
                var role = t.Role;
                if (role != UserRole.Admin)
                {
                    role = await homeworkService.GetHWRoleAsync(hwID, t.UserID);
                }
                if (role == UserRole.Student)
                {
                    throw new Exception("权限不足");
                }
                await homeworkService.RemoveHomeworkAsync(hwID);

                return(new { Res = true });
            }
            catch (Exception e)
            {
                return(new { Res = false, Error = e.Message });
            }
        }