// libs/event.js
// eventBus
// import { ArraySpliceOne } from './utils'
function EventBus() {
  this._events = {}
}
EventBus.prototype.on = function (type, fn, ctx = this) {
  if (!this._events[type]) {
    this._events[type] = []
  }
  this._events[type].push([fn, ctx])
}
EventBus.prototype.once = function (type, fn, ctx = this) {
  function magic() {
    this.off(type, magic)
    fn.apply(ctx, arguments)
  }
  magic.fn = fn
  this.on(type, magic)
}
EventBus.prototype.off = function (type, fn) {
  let _events = this._events[type]
  if (!_events) {
    return
  }
  if (!fn) {
    this._events[type] = null
    return
  }
  let count = _events.length
  while (count--) {
    if (_events[count][0] === fn || (_events[count][0] && _events[count][0].fn === fn)) {
      // ArraySpliceOne(_events, count)
_events.splice(count, 1)
    }
  }
}
EventBus.prototype.emit = function (type) {
  let events = this._events[type]
  if (!events) { return }
  let len = events.length
  let copyEvents = [...events]
  for (let i = 0; i < len; i++) {
    let event = copyEvents[i]
    let [fn, ctx] = event
    if (fn) {
      fn.apply(ctx, [].slice.call(arguments, 1))
    }
  }
}
EventBus.prototype.offAll = function () {
  this._events = {}
}
export default new EventBus()

使用

// libs/index.js
// 挂载到vue原型上，以方便使用。（当然也可以不在页面里面导入使用）
import Vue from 'vue'
import EventBus from './event'
Vue.prototype.$EventBus = EventBus

// main.js
// main入口文件引入
import './libs'

// home/a.vue
this.$EventBus.emit('optClick', obj)
// about/b.vue
mounted() {
    this.$EventBus.on('optClick', (data) => {
        this.optClick(data)
    })
}
methods: {
    optClick(){}
},
beforeDestroy() {
    this.$EventBus.off('optClick')
},