// /src/components/MessageBox/index.vue
<template>
 <p class="message-box" v-show="isShowMessageBox">
 <p class="mask" @click="cancel"></p>
 <p class="message-content">
 <svg class="icon" aria-hidden="true" @click="cancel">
 <use xlink:href="#icon-delete"></use>
 </svg>
 <h3 class="title">{{ title }}</h3>
 <p class="content">{{ content }}</p>
 <p>
 <input type="text" v-model="inputValue" v-if="isShowInput" ref="input">
 </p>
 <p class="btn-group">
 <button class="btn-default" @click="cancel" v-show="isShowCancelBtn">{{ cancelBtnText }}</button>
 <button class="btn-primary btn-confirm" @click="confirm" v-show="isShowConfimrBtn">{{ confirmBtnText }}</button>
 </p>
 </p>
 </p>
 </template>
 
 <script>
 export default {
 props: {
 title: {
 type: String,
 default: '標題'
 },
 content: {
 type: String,
 default: '這是彈框內容'
 },
 isShowInput: false,
 inputValue: '',
 isShowCancelBtn: {
 type: Boolean,
 default: true
 },
 isShowConfimrBtn: {
 type: Boolean,
 default: true
 },
 cancelBtnText: {
 type: String,
 default: '取消'
 },
 confirmBtnText: {
 type: String,
 default: '確定'
 }
 },
 data () {
 return {
 isShowMessageBox: false,
 resolve: '',
 reject: '',
 promise: '' // 保存promise對象
 };
 },
 methods: {
 // 確定,將promise斷定為resolve狀態
 confirm: function () {
 this.isShowMessageBox = false;
 if (this.isShowInput) {
 this.resolve(this.inputValue);
 } else {
 this.resolve('confirm');
 }
 this.remove();
 },
 // 取消,將promise斷定為reject狀態
 cancel: function () {
 this.isShowMessageBox = false;
 this.reject('cancel');
 this.remove();
 },
 // 彈出messageBox,并創建promise對象
 showMsgBox: function () {
 this.isShowMessageBox = true;
 this.promise = new Promise((resolve, reject) => {
 this.resolve = resolve;
 this.reject = reject;
 });
 // 返回promise對象
 return this.promise;
 },
 remove: function () {
 setTimeout(() => {
 this.destroy();
 }, 300);
 },
 destroy: function () {
 this.$destroy();
 document.body.removeChild(this.$el);
 }
 }
 };
 </script>
 <style lang="scss" scoped>
 // 此處省略 ...
 </style> 

// /src/components/MessageBox/index.js
import msgboxVue from './index.vue'; 
// 定義插件對象
const MessageBox = {};
// vue的install方法，用于定義vue插件
MessageBox.install = function (Vue, options) {
 const MessageBoxInstance = Vue.extend(msgboxVue);
 let currentMsg;
 const initInstance = () => {
 // 實例化vue實例
 currentMsg = new MessageBoxInstance();
 let msgBoxEl = currentMsg.$mount().$el;
 document.body.appendChild(msgBoxEl);
 };
 // 在Vue的原型上添加實例方法，以全局調用
 Vue.prototype.$msgBox = {
 showMsgBox (options) {
 if (!currentMsg) {
 initInstance();
 }
 if (typeof options === 'string') {
 currentMsg.content = options;
 } else if (typeof options === 'object') {
 Object.assign(currentMsg, options);
 }
 return currentMsg.showMsgBox()
 .then(val => {
 currentMsg = null;
 return Promise.resolve(val);
 })
 .catch(err => {
 currentMsg = null;
 return Promise.reject(err);
 });
 }
 };
};
export default MessageBox;

// src/main.js
import MessageBox from './components/MessageBox/index';
Vue.use(MessageBox);

this.$msgBox.showMsgBox({
 title: '添加分類',
 content: '請填寫分類名稱',
 isShowInput: true
}).then(async (val) => {
 // ... 
}).catch(() => {
 // ...
});