js继承

1.es6得继承

class Person{
    constructor(){
        this.age = 20
    }
}

class Boy extends Person{
    constructor(){
    super();
        this.name = '张三'
    }
}

let boy = new Boy()
conslo.log(boy)

2.原型链继承

function Car(){
    this.lunzi = 4
}

function Audi(){
    this.name = '奥迪'
}

Audi.prototypr = new Car()
let audi = new Audi()
console.log(audi)

3.借用构造函数继承

function Car(){
    this.lunzi = 4
}

function Audi(){
    Car.call(this)
    this.name = '奥迪'
}
let audi = new Audi()
console.log(audi)

4.组合继承

function Car(){
    this.lunzi = 4
}

function Audi(){
    Car.call(this)
    this.name = '奥迪'
}

Audi.prototypr = new Car()
let audi = new Audi()
console.log(audi)

5.拷贝继承

function Cat(name){
  var animal = new Animal();
  for(var p in animal){
    Cat.prototype[p] = animal[p];
  }
  this.name = name || 'Tom';
}

// Test Code
var cat = new Cat();

6.寄生组合继承

function Cat(name){
  Animal.call(this);
  this.name = name || 'Tom';
}
(function(){
  // 创建一个没有实例方法的类
  var Super = function(){};
  Super.prototype = Animal.prototype;
  //将实例作为子类的原型
  Cat.prototype = new Super();
})();

// Test Code
var cat = new Cat();