<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="app">
        <div v-if="flag">从一而终</div>
        <div v-show="flag">反复无常</div>
        <input type="button" value="隐藏/显示" @click="flag=!flag">
    </div>

    <script src="../js/vue.js"></script>
    <script>
        const vm = new Vue({
            el:'#app',
            data:{
                flag : true, //标记，是否展示
            }
        })
    </script>
</body>
</html>