(function() {
    // 父类
    class Animal {
        name:string;
        color:string;
        constructor(name:string,color:string) {
            this.name = name;
            this.color = color;
        }
        eat() {
            console.log("好吃爱吃多吃")
        }
    }
    // 猫
    class Cat extends Animal {
        age:number;
        /**
         * 若子类继承父类
         * 子类的构造函数中必须对父类的构造函数进行重写
         */
        constructor(a:string,b:number,c:string) {
            super(a,c);
            this.age = b;
        }
    }
    let animal = new Animal("猫",'白');
    let cat = new Cat('妹妹',3,'黄')
    console.log(animal)
    console.log(cat)
})()