事件总线 $emit 的别名

Aliases for event bus $emit

我想为常用的事件总线方法创建别名 $emit$on 等...

这样我就可以像这样引用事件总线对象:EventBus.publish(...)

我试过了:

import Vue from 'vue'
const EventBus = new Vue()

export const publish = EventBus.$emit
export const subscribe = EventBus.$on

然后:

import * as EventBus from '@/utils/eventBus.js'

但我得到 $emit is not a function

我做错了什么?

谢谢

确保绑定到对象,否则该方法将不起作用:

import Vue from 'vue'
const EventBus = new Vue()

export const publish = EventBus.$emit.bind(EventBus)
export const subscribe = EventBus.$on.bind(EventBus)
export const unsubscribe = EventBus.$off.bind(EventBus)

或更明确地说:

export function publish(name, ...args) {
  EventBus.$emit(name, ...args)
}

export function subscribe(name, fn) {
  EventBus.$on(name, fn)
}

export function unsubscribe(name, fn) {
  EventBus.$off(name, fn)
}

你这样导入它:

import * as EventBus from './eventBus.js'

EventBus.subscribe('event', handler)