Javascript:将事件侦听器附加到Array以进行Push()事件

class ArrayProxy {
  constructor() {
    this.array = [];
    this.listeners = [];
  }

  push(item) {
    this.array.push(item);
    this.notifyListeners('push', item);
  }

  addEventListener(event, listener) {
    this.listeners.push({ event, listener });
  }

  removeEventListener(event, listener) {
    this.listeners = this.listeners.filter(l => l.event !== event || l.listener !== listener);
  }

  notifyListeners(event, data) {
    this.listeners.filter(l => l.event === event).forEach(l => l.listener(data));
  }
}

const arrayProxy = new ArrayProxy();

arrayProxy.addEventListener('push', item => {
  console.log(`Item ${item} has been pushed to the array.`);
});

arrayProxy.push(1);
arrayProxy.push(2);
arrayProxy.push(3);