vue 添加 class
1:
<style>
.green{background-color:black}
.size{fount-size:18px}
</style>
2:
<body>
<div id="app">
<div :class="cls">天上的星</div>
<div :class="{ green: true, red: true }">星星 </div>
</div>
3:
<script src="./vue.js"></script>
<script>
var vm = new Vue({
el: '#app',
data: {
cls: 'green'
}
})
</script>
</body>