// 定义一个基础命令
class Love {
  express() {
    cosnole.log("to be brave");
  }
}

// 定义一个命令对象
class Valentine extends Love {
  expressToMysun() {
    console.log("i wanna accompany with you forever");
  }
  express() {
    this.expressToMysun();
  }
}

const me = new Valentine();
// 接受者接收这个命令对象
class Reciver {
  constructor(girl) {
    this.girl = girl;
  }
  setCommand(person, commandExpress) {
    this.girl[person] = commandExpress;
  }
  getLove(person) {
    this.girl[person].express();
  }
}

let sun = [];
const girlFriend = new Reciver(sun);
girlFriend.setCommand(0, me);
girlFriend.getLove(0);