export {}
class Person {
  myName: string
  constructor(n: string) {
    this.myName = n
  }
  getName() {
    return this.myName
  }
}

class Male extends Person {
  age: number
  constructor(name: string, age: number) {
    super(name) // 调用回父类的constructor,并把参数传进去
    this.age = age
  }
  getName() {
    // 重新写了getName这个方法
    return '我叫：' + this.myName
  }
}

let m = new Male('lisa', 16)