public ActionResult GetAccount(string username, [FromQuery] string password)
        {
            /* 登录账户 若验证成功 则返回token*/
            var account = _accountsService.Get(username);

            if (account == null)
            {
                return(NotFound("username or password error."));
            }

            if (!_accountsService.CheckPassword(account, password))
            {
                return(NotFound("username or password error."));
            }

            // 为客户端产生token
            var token    = _tokensService.NewToken(account.Id, account.Username);
            var response = new Response <Dictionary <string, string> >(new Ok())
            {
                resultBody = new Dictionary <string, string>()
                {
                    ["token"] = token
                }
            };

            return(Ok(response));
        }