Vue 有哪些主要的指令修饰符-编程知识

Vue 有哪些主要的指令修饰符

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>

本文来自互联网用户投稿，该文观点仅代表作者本人，不代表本站立场。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如若转载，请注明出处：http://www.hqwc.cn/news/599131.html

如若内容造成侵权/违法违规/事实不符，请联系编程知识网进行投诉反馈email:809451989@qq.com，一经查实，立即删除！