实现一个观察者模式

实现一个基础当观察者模式,当被观察者变动当时候,通知观察者.

class Observer {
  constructor(name) {
    this.name = name;
  }
  update(updateInfo) {
    console.log(`${this.name}更新,更新消息为${updateInfo}`);
  }
}

class Observerd {
  constructor() {
    this.observerList = [];
  }
  addObserve(observer) {
    this.observerList.push(observer);
  }

  notice(updateInfo = "更新消息") {
    for (let observe of this.observerList) {
      observe.update(updateInfo);
    }
  }
}

let fooObserve = new Observer("foo");
let barObserve = new Observer("bar");

let observed = new Observerd();

observed.addObserve(fooObserve);
observed.addObserve(barObserve);
observed.notice("测试消息");