菜鸟教程在线编辑器

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                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Vue 测试实例 - 菜鸟教程(runoob.com)</title>
<script src="https://cdn.staticfile.net/vue/3.0.5/vue.global.js"></script>
<style>
.active {
    width: 100px;
    height: 100px;
    background: green;
}
</style>
</head>
<body>
<div id="app">
    <div :class="{ 'active': isActive }"></div>
</div>

<script>
const app = {
    data() {
      return {
         isActive: true
      }
   }
}

Vue.createApp(app).mount('#app')
</script>
</body>
</html>
              