<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
		<div id="app">
			<h2>当前计数：{
  {counter}}</h2>
			<button v-on:click="add">+</button>
			<button v-on:click="sub">-</button>
			
		</div>
		<script src="../js/vue.min.js"></script>
		
		<script> const app = new Vue({
     el: '#app', data: {
     counter: 0 }, methods: {
     add: function(){
     this.counter++ }, sub: function(){
     this.counter-- } } }) </script>
	</body>
</html>