js es5构造函数继承和es6类继承

es5构造函数继承

    function Phone(brand, price){
        this.brand = brand;
        this.price = price;
    }
    Phone.prototype.call = function(){
        console.log("打电话");
    }
    function SmartPhone(brand, price, color, size){
        Phone.call(this, brand, price);
        this.color = color;
        this.size = size;
    }
    // 设置子级构造函数的原型
    SmartPhone.prototype = new Phone;
    SmartPhone.prototype.constructor = SmartPhone;//校正
    // 声明子类的方法
    SmartPhone.prototype.photo = function(){
        console.log("拍照");
    }
    SmartPhone.prototype.playGame = function(){
        console.log("玩游戏");
    }
    const Huawei = new SmartPhone("华为",5499,"黑色","5.5inch");
    console.log(Huawei);

es6类继承

    class Phone{
        // 构造方法
        constructor(brand, price){
            this.brand = brand;
            this.price = price;
        }
        call(){
            console.log("打电话");
        }
    }
    class SmartPhone extends Phone {
        // 构造方法
        constructor(brand, price, color, size){
            super(brand,price);
            this.color = color;
            this.size = size;
        }
        photo(){
            console.log("拍照");
        }
        playGame(){
            console.log("玩游戏");
        }
        // 重写父类方法
        call(){
            console.log("视频通话");
        }
    }
    const Huawei = new SmartPhone("华为",5499,"黑色","5.5inch")
    console.log(Huawei)
    Huawei.call();
    Huawei.photo();
    Huawei.playGame();