最简单的vue消息提示全局组件的方法

<template>
 <div class="app-toast"
    v-if="isShow"
    :class="{'info': type=== 'info','success': type=== 'success','wraning': type=== 'wraning','danger': type=== 'danger'}">{{text}}</div>
</template>
<style scoped>
.app-toast {
 position: fixed;
 left: 50%;
 top: 50%;
 background: #ccc;
 padding: 10px;
 border-radius: 5px;
 transform: translate(-50%, -50%);
 color: #fff;
}
.info {
 background: #00aaee;
}
.success {
 background: #00ee6b;
}
.wraning {
 background: #eea300;
}
.danger {
 background: #ee000c;
}
</style>

import vue from 'vue'
import toastComponent from './toast.vue'

// 组件构造器，构造出一个 vue组件实例
const ToastConstructor = vue.extend(toastComponent)

function showToast ({ text, type, duration = 2000 }) {
 const toastDom = new ToastConstructor({
  el: document.createElement('div'),
  data () {
   return {
    isShow: true, // 是否显示
    text: text, // 文本内容
    type: type // 类型
   }
  }
 })
 // 添加节点
 document.body.appendChild(toastDom.$el)
 // 过渡时间
 setTimeout(() => {
  toastDom.isShow = false
 }, duration)
}
// 全局注册
function registryToast () {
 vue.prototype.$toast = showToast
}

export default registryToast

import toastRegistry from './toast/index'
Vue.use(toastRegistry)

<template>
 <div class="home">
  <input type="button"
      value="显示弹窗"
      @click="showToast">
 </div>
</template>

<script>

export default {
 name: 'home',
 methods: {
  showToast () {
   this.$toast({
    text: '我是消息'
    // type: 'wraning',
    // duration: 3000
   })
  }
 }
}
</script>