面向对象的特征

面向对象基础语法

class User{
  constructor(name, password){
    this.name = name
    this.password = password
  }
  showName(){
    console.log(this.name)
  }
}
//继承
class Vip extends User{
  constructor(name, password, level){
    super(name, password)
    this.level = level
  }
  showLevel(){
    console.log(this.level)
  }
}
let v = new Vip('张三', '21222', 9)
v.showName()  // 张三
v.showLevel() // 9