从Seuquelize返回，然后返回JavaScript中的代码块

const Sequelize = require('sequelize');

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

// 定义模型
const User = sequelize.define('user', {
  firstName: {
    type: Sequelize.STRING,
    allowNull: false,
  },
  lastName: {
    type: Sequelize.STRING,
    allowNull: false,
  },
});

// 查询数据
User.findAll().then(users => {
  // 返回JavaScript中的代码块
  console.log(users);
}).catch(error => {
  console.error('Error:', error);
});