代码
提交代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div id="app">
<div>商品数量 {{count}}</div>
<button v-on:click="add"> 加一个 </button>
</div>
</body>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script>
var vm = new Vue({
el: '#app',
data: {
count: 0
},
methods: {
add() {
this.count = this.count + 1
}
}
})
</script>
</html>
运行结果