// (function(){})() 
(function() {
    class Money {
        name: string;
        num: number;
        constructor(name:string,num:number) {
            this.name = name;
            this.num = num;
        }
        say() {
            console.log("你好")
        }
    }
    /**
     * super
     * 如果子类要使用父类中属性
     * 子类的构造函数必须对父类的构造函数重新进行接受
     * 使用super
     */
    class A extends Money {
        age:number;
        constructor(name:string,num:number,age:number) {
            super(name,num);
            this.age=age;
        }
    }
    class B extends Money {

    }
    let a = new A('喜羊羊',100,18);
    let b = new B('灰太狼',50);
    console.log(a,'a');
    console.log(b,'b')
})()