<template>
 <div class="popup-wrapper" v-show="visible" @click="hide">
  <div class="popup-text">{{text}}</div>
 </div>
</template>

export default {
 name: 'popup',
 props: {
  text: { //文字内容
   type: String,
   default: ''
  },
  time: { //显示的时长
   type: Number,
   default: 3e3
  },
 },
 data(){
  return {
   visible: false
  }
 },
 methods: {
  open() {
   this.visible = true
   clearTimeout(this.timeout);
   this.$emit('show')
   if(this.time > 0){
    this.timeout = setTimeout(() => {
     this.hide()
    }, this.time)
   }
  },
  hide() {
   this.visible = false
   this.$emit('hide')
   clearTimeout(this.timeout);
  }
 }
}

<template>
 <popup ref="popup" text="弹窗内容" :time="1e3"></popup>
</template>
<script>
import Popup from '@/components/popup'
 ...
  this.$refs.popup.open()
  ...
</script>

// plugins/popupVm.js
import Popup from '@/components/popup'
let $vm
export const factory = (Vue)=> {
 if (!$vm) {
  let Popup = Vue.extend(PopupComponent)
  $vm = new Popup({
   el: document.createElement('div')
  })
  document.body.appendChild($vm.$el)
 }
 return $vm
}

// plugins/util.js
export const setProps = ($vm, options) => {
 const defaults = {}
 Object.keys($vm.$options.props).forEach(k => {
  defaults[k] = $vm.$options.props[k].default
 })
 const _options = _.assign({}, defaults, options)
 for (let i in _options) {
  $vm.$props[i] = _options[i]
 }
}

// plugins/popupPlugin.js
import { factory } from './popupVm'
import { setProps } from './util'

export default {
 install(Vue) {
   let $vm = factory(Vue);

   const popup = {
   open(options) {
    setProps($vm, options)
    //监听事件
    typeof options.onShow === 'function' && $vm.$once('show', options.onShow);
    typeof options.onHide === 'function' && $vm.$once('hide', options.onHide);
    $vm.open();
   },
   hide() {
    $vm.hide()
   }，
   //只配置文字
   text(text) {
    this.open({ text })
   }
  }
  
  Vue.prototype.$popup = popup
 }
}

//main.js
import Vue from 'vue'
import PopupPlugin from '@/plugins/popupPlugin'

Vue.use(PopupPlugin)
在vue框架内调用就非常方便了

<script>
 ...
  this.$popup.text('弹窗消息')
 ...
</script>