js面向对象

class Star {
    // constructor构造函数
    constructor (name, age){
        this.name = name;
        this.age = age
    }
    sing(song){
        // console.log(‘唱歌‘)
        console.log(this.name + ‘唱‘+ song)
    }
}

// 2.利用类创建对象 new
let zbz = new Star(‘张柏芝‘, 18)
let ldh = new Star(‘刘德华‘, 20)
console.log(zbz)
console.log(ldh)

ldh.sing(‘冰雨‘)

class Father {
    constructor(x, y, fistName){
        this.fistName = fistName;
        this.x = x;
        this.y = y;
    }
    money(){
        console.log(‘钱‘,1000);
    }
    sum(){
        console.log(‘父类的加法‘, this.x + this.y)
    }
    say(){
        return ‘我是父类‘
    }
}
// 子继承父类
class Son extends Father {
    constructor(x,y, name){
        super(x,y); // super调用父类中的构造函数,必须放在this前面
        this.x = x;
        this.y = y;
        this.name = name
    }
    say(){
        // super.say() 调用父类中的普通函数
        console.log(super.say() + ‘的儿子‘)
    }
    jianfa(){
        let jianfa = `${this.name}自己的减法,${this.x - this.y}`
        console.log(jianfa)
    }

}
var son1 = new Son(3,2)
son1.money()
son1.sum()
son1.say()
var son2 = new Son(3,2, ‘小明‘)
son2.jianfa()