(function () {
    class Animal {
        constructor(type, color) {
            this.type = type;
            this.color = color;
        }
        say() {
            console.log(`这有一只${this.type}`);
        }
    }
    /**
     * super 调用父类中的属性
     * 若子类中添加新的属性
     * 子类的构造器需要对父类的构造器中的属性使用super继承
     */
    class Child2 extends Animal {
        constructor(type, color, action) {
            super(type, color);
            this.action = action;
        }
    }
    let a = new Animal('小猫', '白');
    let c = new Child2("小狗", '黑', '汪汪');
    console.log(a);
    a.say();
    console.log(c);
})();