海浪Code

Appearance

  1. v-if
  2. v-show
html
<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Vue</title>
    <script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.js"
        type="application/javascript"></script>
</head>

<body>
    <div id="root">
        <!-- v-show 控制元素的显示(style) -->
        <!-- 高频率切换使用 v-show，低频率用 v-if -->
        <h2 v-show="true">Hello, {{name}}!</h2>
        <!-- v-if 做条件渲染(element) -->
        <!-- v-else-if -->
        <!-- v-else(不用写条件) -->
        <!-- 注意点：if判断结构不能被打断 -->
        <h2>当前a的值是 {{a}}</h2>
        <button type="button" @click="a++">a++</button>
        <!-- template 只能配合 v-if -->
        <template v-if="a == 2">
            <h2>Angular</h2>
            <h2>React</h2>
            <h2>Vue</h2>
        </template>
    </div>
    <script>
        Vue.config.productionTip = false;
        const vm = new Vue({
            el: '#root',
            data: {
                name: 'Vue',
                a:1,
            },
            methods: {
            }
        })
    </script>
</body>

</html>