Vue 有哪些主要的指令修饰符

时间：2024-04-11 22:22:21

 

目录

1. 什么是指令修饰符

2. 指令修饰符有哪些

2.1. 按键修饰符

2.2. v-model修饰符

2.3. 事件修饰符

1. 什么是指令修饰符

  • 通过 "." 指明一些指令 后缀，不同 后缀 封装了不同的处理操作

目的：简化代码

2. 指令修饰符有哪些

2.1. 按键修饰符
  • @keyup.enter

作用：键盘回车监听

<!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>Document</title>
</head>
<body>

  <div id="app">
    <input @keyup.enter="fn" v-model="username" type="text">
  </div>

  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        username: ''
      },
      methods: {
        fn () {
          console.log('键盘回车的时候触发', this.username)
        }
      }
    })
  </script>
</body>
</html>
2.2. v-model修饰符
  • v-model.trim

作用：去除首尾空格

<!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>Document</title>
</head>
<body>
  
  <div id="app">
    姓名：<input v-model.trim="username" type="text"><br>
  </div>

  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        username: ''
      },
    })
  </script>
</body>
</html>
  • v-model.number

作用：转数字

<!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>Document</title>
</head>
<body>

  <div id="app">
    年纪：<input v-model.number="age" type="text"><br>
  </div>

  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        age: ''
      },
    })
  </script>
</body>
</html>
2.3. 事件修饰符
  • @事件名.stop

作用：阻止冒泡

<!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>Document</title>
  <style>
    .father {
      width: 200px;
      height: 200px;
      background-color: pink;
      margin-top: 20px;
    }
    .son {
      width: 100px;
      height: 100px;
      background-color: skyblue;
    }
  </style>
</head>
<body>

  <div id="app">
    <div @click="fatherFn" class="father">
      <div @click.stop="sonFn" class="son">儿子</div>
    </div>
  </div>

  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      methods: {
        fatherFn () {
          alert('老父亲被点击了')
        },
        sonFn () {
          alert('儿子被点击了')
        }
      }
    })
  </script>
</body>
</html>
  • @事件名.prevent

作用：阻止默认行为

<!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>Document</title>
</head>
<body>

  <div id="app">
    <a @click.prevent href="http://www.baidu.com">阻止默认跳转百度</a>
  </div>

  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app'
    })
  </script>
</body>
</html>

相关文章