说明：在用node后台服务器时，遇到无法连接mysql错误：1251

  code: 'ER_NOT_SUPPORTED_AUTH_MODE',
  errno: 1251,
  sqlMessage: 'Client does not support authentication protocol requested by server; consider upgrading MySQL client',
  sqlState: '08004',
  fatal: true
}

解决：
进入mysql终端：
直接cmd mysql 也可以

输入：

 ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';
 // 'password'是你的数据库密码

FLUSH PRIVILEGES;