es6 class

1. 面向对象 OOP的三大特点
   1. 封装，集成，多态
2. Object对象，类的实例 ``jsx class Parent { constructor (name) { this.name = name } say () { returnMy name is ${this.name}` } } const user = new Parent(‘lucy’) user.say()

// 继承，拥有父类的属性和方法 class Child extends Parent { eat () { return ‘it\’s time for dinner’ } } const user2 = new Parent(‘good’) user2.say() user2.eat()

// 多态，子类重写父类方法 clas Child3 extends Parent { static array = [100, 200] // 静态属性

constructor(name) { super(name) console.log(‘name’, this.name) }

say () { // 调用父类的方法，要用 super关键字 return good every day, ${this.name} + super.say() } } const mao = new Child3(‘maomao’) maomao.say() Child3.array ```