/// <summary>
        /// 创建一个用户
        /// </summary>
        /// <param name="usr">要创建的用户信息</param>
        /// <returns>创建是否成功</returns>
        public static string CreateUser(User usr)
        {
            if (!UserCheck.CheckUsername(usr.name))
            {
                return("用户名格式不对");
            }
            if (!UserCheck.CheckUserpswd(usr.password))
            {
                return("用户密码格式不对");
            }
            int result = int.Parse((string)Request.HttpRequest(usr, "PATCH", "CreateUser"));

            return(result.ToString());//ID
        }
        /// <summary>
        /// 更新用户
        /// </summary>
        /// <param name="usr">要更新的用户信息</param>
        /// <returns>更新是否成功</returns>
        public static string UpdateUser(User usr)
        {
            if (!UserCheck.CheckUsername(usr.name))
            {
                return("用户名格式不对");
            }
            if (!UserCheck.CheckUserpswd(usr.password))
            {
                return("用户密码格式不对");
            }
            string result = (string)Request.HttpRequest(usr, "PUT", "UpdateUser");

            if (result == "true")
            {
                return("true");
            }
            else
            {
                return("false");
            }
        }