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>
