小程序父孙组件 孙触发事件传递给父组件 简单eventBus

• 环境：ts

WeappEventBus.ts：事件公交回调类

interface CallBackObj {
  [index:string]: Function
}

class EventBus {
  private eventObj: CallBackObj = {}

  constructor() {
    console.log('event bus initing ...');
  }

  /**
   * 创建回调函数, 同名会覆盖, {key: callback}必须都传
   */
  on(key: string, callback: Function): void {
    if(!(key && callback)) return;
    this.eventObj[key] = callback;
  }

  /**
   * 触发指定回调
   */
  emit(key: string, params: Array<any>): void {
    if (!key) return;
    this.eventObj[key](params); // 调用对象存储的方法并传参
  }

  /**
   * 移除回调
   * @param key 
   * @returns 
   */
  remove(key: string): void {
    if (!key || !this.eventObj[key]) return;
    delete this.eventObj[key];
  }
}

const eventBus = new EventBus;

export {
  eventBus
}

app.ts引入

// app.ts
import { eventBus } from './utils/weappEventBus';

App<IAppOption>({
  globalData: {
    bus: null
  },
  onLaunch() {
    this.globalData.bus = eventBus;
    this.globalData.bus.on('xxx',(params: Array<any>) => {
      console.log(params);
    })
  }
})

孙组件.ts：模拟网络请求后孙组件传递事件给父组件

  created(): void {
    setTimeout(() => {
      BUS.emit('xxx', {
        name: 'bill',
        age: 21
      });
    }, 1000);
  }
  
  pageLifetimes: {
    hide: function() {
      BUS.remove('xxx');
    },
  }

• 效果