(function () {
    class Animal {
        constructor(name, sex) {
            this.name = name;
            this.sex = sex;
        }
        eat() {
            console.log("吃东西");
        }
    }
    class Cat extends Animal {
        constructor(name, sex, age) {
            super(name, sex);
            this.age = age;
        }
    }
    let c = new Cat('淼淼', '女', 3);
    console.log(c.name);
    console.log(c.sex);
    console.log(c.age);
    c.eat();
})();