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【Vue】条件渲染: V-for:列表渲染、条件渲染: v-if和键盘修饰符
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条件渲染: V-for:列表渲染、条件渲染: v-if和键盘修饰符

1. Vue V-for:列表渲染

  1. <!DOCTYPE html>
  2. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  7.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  8.     <title>V-for:列表渲染</title>
  9.     <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
  11.     <div class="app">
  12.         <ul>
  13.             <li>{{cities[0]}}</li>
  14.             <li>{{cities[1]}}</li>
  15.             <li>{{cities[2]}}</li>
  16.         </ul>
  17.         <hr>
  18.         <!-- 数组渲染 -->
  19.         <!-- v-for指令快速循环输出列表 -->
  20.         <ul>
  21.             <!-- key:diff算法,实现高效的渲染，大数量时有用 -->
  22.             <li v-for="(city,key) of cities" :key="key">{{key}} : {{city}}</li>
  23.         </ul>
  24.         <hr>
  25.         <!-- 对象渲染 -->
  26.         <ul>
  27.             <li v-for="(item,key) of user" :key="key">{{key}} : {{item}}</li>
  28.         </ul>
  29.         <hr>
  30.         <!-- 对象渲染 -->
  31.         <ul>
  32.             <li v-for="(item,key) of users" :key="key"> {{item.name}} : {{item.email}} : {{item.phone}}</li>
  33.         </ul>
  34.     </div>
  37.     <script>
  38.         const app = Vue.createApp({
  39.             data() {
  40.                 return {
  41.                     // 数组类型
  42.                     cities: ['合肥', '上海', '南京'],
  43.                     // 对象类型
  44.                     user: {
  45.                         name:'老马',
  46.                         email:'nx77@qq.com',
  47.                         phone:'13909511100',
  48.                     },
  49.                     // 对象数组
  50.                     users:[
  51.                     {
  52.                         name:'老马',
  53.                         email:'nx77@qq.com',
  54.                         phone:'13909511100',
  55.                     },
  56.                     {
  57.                         name:'老李',
  58.                         email:'nx88@qq.com',
  59.                         phone:'13909511100',
  60.                     },
  61.                     {
  62.                         name:'老王',
  63.                         email:'nx77@qq.com',
  64.                         phone:'13909511100',
  65.                     },
  66.                     ]
  67.                 };
  68.             },
  69.         });
  70.         const vm = app.mount('.app');
  71.     </script>
  72. </head>
  74. <body>
  76. </body>
  78. </html>

2. Vue 条件渲染: v-if

  1. <!DOCTYPE html>
  2. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  7.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  8.     <title>条件渲染: v-if</title>
  9.     <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
  11. </head>
  13. <body>
  14.     <div class="app">
  15.         <!-- v-if:条件渲染指令 -->
  16.         <p v-if="flag">{{message}}</p>
  17.         <!-- !取反操作 ,如：flag = !flag-->
  18.         <button @click="flag = !flag" v-text="flag ? '隐藏':'显示'"></button>
  19.         <!-- if-else,if elseif if -->
  20.         <!-- p >= 1000 and p < 2000 -->
  21.         <p v-if="point >= 1000 && point < 2000">{{grade[0]}}</p>
  22.         <p v-else-if="point >= 2000 && point < 3000">{{grade[1]}}</p>
  23.         <p v-else-if="point >= 3000 && point < 4000">{{grade[2]}}</p>
  24.         <p v-else>{{grade[3]}}</p>
  25.     </div>
  26.     <script>
  27.         Vue.createApp({
  28.             data() {
  29.                 return {
  30.                     message: '前端快结束了',
  31.                     flag: true,
  32.                     //会员plus级别
  33.                     grade:['普通会员','高级会员','金牌会员','至尊会员'],
  34.                     //积分
  35.                     point:5000,
  36.                 };
  37.             },
  38.         }).mount('.app');
  39.     </script>
  40. </body>
  41. </html>

3. Vue 键盘修饰符

  1. <!DOCTYPE html>
  2. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  7.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  8.     <title>键盘修饰符</title>
  9.     <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
  11. </head>
  13. <body>
  14.     <div class="app">
  15.         <!-- @keyup.enter ：Vue监听鼠标回车事件 -->
  16.         <input type="text" @keyup.enter="submit($event)">
  17.         <ul>
  18.             <li v-for="(item,key) of list">{{item}}</li>
  19.         </ul>
  20.     </div>
  21.     <script>
  22.         Vue.createApp({
  23.             data() {
  24.                 return {
  25.                     // 留言列表
  26.                     list: [],
  27.                 };
  28.             },
  29.             methods: {
  30.                 submit(ev) {
  31.                     // 将输入的字符串放入 list 数组
  32.                     this.list.unshift(ev.target.value);
  33.                     ev.target.value = null;
  34.                 },
  35.             },
  36.         }).mount('.app');
  37.     </script>
  38. </body>
  39. </html>
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