实例演示条件渲染与列表渲染 - 大前端

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列表渲染

<!DOCTYPE html>
<html lang="en">
<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>列表渲染:v-for</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>
<body>
    <div class="app">
        <!-- array -->
        <ul>
            <li>{{cities[0]}}</li>
            <li>{{cities[1]}}</li>
            <li>{{cities[2]}}</li>
        </ul>      
        <hr>
        <!-- v-for: 指令循环输出 -->
        <ul>
            <!-- <li v-for="city of cities">{{city}}</li> -->
            <li v-for="(city,index) of cities" :key="index">{{index}} : {{city}}</li>
        </ul>
        <hr>
        <!-- v-for:对象数组 -->
        <ul>
          <!-- <li v-for="city of cities">{{city}}</li> -->
          <li v-for="(user,index) of users" :key="index">{{user.name}} : {{user.email}}</li>
        </ul>
      <hr>
    </div>
    <script>
        const app = Vue.createApp({
          data() {
            return {
              // array
              cities: ['深圳', '广州', '中山'],
              // object: 关联数组
              user: {
                name: '老朱',
                email: 'laozhu@php.cn',
              },
              // array of object
              users: [
                {
                  name: '老朱',
                  email: 'laozhu@php.cn',
                },
                {
                  name: '老李',
                  email: 'laoli@php.cn',
                },
                {
                  name: '老陈',
                  email: 'laochen@php.cn',
                },
              ],
            };
          },
        }).mount('.app');
      </script>
</body>
</html>

条件渲染

<!DOCTYPE html>
<html lang="en">
<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>条件渲染: v-if</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>
<body>
    <div class="app">
        <p v-if="flag">{{message}}</p>
        <button @click="flag=!flag" v-text="flag ?'隐藏' : '显示'"></button>
        <!-- if-else, if else if else -->
        <p v-if="point>=100 && point<500">{{grade[0]}}</p>
        <p v-else-if="point>=500 && point<1500">{{grade[1]}}</p>
        <p v-else-if="point>=1500 && point<2500">{{grade[2]}}</p>
        <p v-if="point>=2500">{{grade[3]}}</p>
        <!-- <p v-else>{{grade[4]}}</p> -->
    </div>
    <script>
        Vue.createApp({
            data(){
                return{
                    message: 'xx网咖',
                    flag: true,
                     // 会员级别
                    grade: ['普通会员', '黄金会员', '白银会员', '钻石会员', '非会员'],
                    // 积分
                    point: 2500,
                };
            },
        }).mount('.app');
    </script>
</body>
</html>

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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