09.条件判断v-if
<body> <div id="app"> <h2 v-if="true"> {{ message }} </h2> <h1 v-else> isShow为false时显示</h1> </div> <script src='https://cdn.jsdelivr.net/npm/vue@2.6.12/dist/vue.js'></script> <script> const app = new Vue({ el: '#app', data: { message: "李银河 你好啊", isShow: false, } }) </script> </body>