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                <div id="app">
  我的名字是:<span v-model="myName"></span>
  <input type="text" v-model="myName">





var model = {
  el: '#app',
  data: {
    myName: 'Ray',

var data =;
var _data = {};
var app = document.querySelector(model.el);
var VModel = app.querySelectorAll('[v-model]');

VModel.forEach((element) => {
  element.addEventListener('input', function() {
    data[this.getAttribute('v-model')] = this.value;

Object.keys(data).forEach((key) => {
  _data[`_${key}`] = data[key];
  Object.defineProperty(data, key, {
    enumerable: true,
    configurable: true,
    get() {
      return _data[`_${key}`];
    set(val) {
      var elementKeys = app.querySelectorAll(`[v-model=${key}]`);
      elementKeys.forEach((item) => {
        item.value = val; // 針對 input 發生變化時也寫入
        item.innerText = val; // 渲染到畫面上
      _data[`_${key}`] = val

setTimeout(() => {
}, 5000)