在Sequelize ORM中仅返回没有字段名的数据

const sequelize = new Sequelize('database', 'username', 'password', {
  host: 'localhost',
  dialect: 'mysql'
});

const User = sequelize.define('User', {
  firstName: {
    type: Sequelize.STRING
  },
  lastName: {
    type: Sequelize.STRING
  }
});

// 查询所有用户的firstName和lastName，仅返回没有字段名的数据
User.findAll({
  attributes: ['firstName', 'lastName'],
  raw: true
}).then(users => {
  console.log(users);
}).catch(err => {
  console.error(err);
});