在页面上简单实现一个计数器：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="../js/vue.js"></script>
</head>
<body>
<div id="app">
<h3>当前计数器:{{counter}}</h3>
<button @click="add">+</button>
<button @click="minutes">-</button>
</div>
<script>
const app = new Vue({
el: "#app",
data: {
counter: 0
},
methods: {
add: function () {
this.counter++;
},
minutes: function () {
this.counter--;
}
}
})
</script>
</body>
</html>
最后实现的效果，看下面的gif图：
