Vue v-once

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="app">
        <h1>会变化 {{msg}}</h1>
        <p>--------------------</p>
        <h1 v-once>不会变化 {{msg}}</h1>
    </div>
    <script src="js/vue.3.2.2.js"></script>
    <script>
        // 1、创建Vue的实例对象
        const app = Vue.createApp({
            data(){//定义数据
                return {
                    msg:'你好！'
                }
            }
        }).mount('#app');
    </script>
</body>
</html>

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