示例：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>计数器</title>
</head>
<body>
<div id="app">
<h2>{
{
counter}}</h2>
<button v-on:click="counter++">+</button>
<button v-on:click="counter--">-</button>
</div>
</body>
<script src="../js/vue.js"></script>
<script>
const app = new Vue({
el: '#app',
data: {
counter: 0
},
})
</script>
</html>
以上情况不推荐使用
示例2：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>计数器</title>
</head>
<body>
<div id="app">
<h2>{
{
counter}}</h2>
<button v-on:click=add>+</button>
<button @click="sub">-</button>
</div>
</body>
<script src="../js/vue.js"></script>
<script>
const app = new Vue({
el: '#app',
data: {
counter: 0
},
methods: {
add: function () {
console.log('+')
this.counter++
},
sub: function () {
console.log('-')
this.counter--
}
}
})
</script>
</html>
推荐使用，其中v-on：等效于@，@是v-on的语法糖