带参和不带参
如果要传参数,必须写(),如不传参数,爱写不写
不写(),默认参数就是event
写() 显式传参,event名字叫:$event
常用的修饰符
阻止默认事件 .prevent
阻止事件冒泡 .stop
一次性事件 .once
自身事件 .self
按键事件 .enter
代码片段
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="./vue.js"></script>
<style>
.box{
width: 100px;
height: 100px;
background: #333333;
}
.outer{
width: 300px;
height: 300px;
background: #333333;
margin: 20px;
}
.inner{
width: 100px;
height: 100px;
background: orange;
}
.mask{
width: 100vw;
height: 100vh;
background: rgba(0, 0, 0, 0.5);
position: fixed;
left: 0px;
top: 0px;
}
.con{
width: 200px;
height: 100px;
position: absolute;
left:0px;
top: 0px;
right: 0px;
bottom: 0px;
margin: auto;
background: #ffffff;
}
</style>
</head>
<body>
<div id="app">
<!-- @click="alert1()" 如果要传参数,必须写(),如不传参数,爱写不写 -->
<button @click="alert1(10)">弹1</button>
<button @click="alert2(10,20)">弹2</button>
<!-- event -->
<!-- 1.不写(),默认参数就是event -->
<button @click="getEvent">event1</button>
<!-- 2.写() 显式传参,event名字叫:$event -->
<button @click="getEvent2($event)">event2</button>
<button @click="getEvent3(10,$event)">event3</button>
<!-- 阻止默认事件 .prevent-->
<div class="box" @contextmenu="contextmenu"></div>
<div class="box" @contextmenu.prevent="contextmenu2"></div>
<!-- 阻止事件冒泡 .stop-->
<div class="outer" @click="outerClick">
<div class="inner" @click.stop.prevent="innerClick"></div>
</div>
<!-- 一次性绑定 .once-->
<div class="inner" @click.once="innerClick"></div>
<!--目标元素是自己才出发 .self -->
<div class="outer" @click.self="outerClick">
<div class="inner" @click="innerClick"></div>
</div>
<button @click="isClose=true;">退出登录</button>
<div class="mask" v-if="isClose" @click.self="isClose=false;">
<div class="con">
<h2>你确定要退出吗?</h2>
<button>确定</button>
<button @click="isClose=false;">取消</button>
</div>
</div>
<!-- enter 按键 -->
<input type="text" @keydown.enter="down()" @keydown.up.prevent="up"
@keydown.down="down2"
>
</div>
<script>
new Vue({
el:"#app",//挂载点
data:{//属性
isClose:false
},
methods:{//方法
alert1(n){
alert(n)
},
alert2(a,b){
alert(a+b)
},
getEvent(e){
console.log(e)
},
getEvent2(ev){
console.log(ev)
},
getEvent3(e,n){
console.log(e)
},
contextmenu(e){
e.preventDefault();
console.log("yjl");
},
contextmenu2(){
console.log("yjl2")
},
innerClick(){
console.log("inner Click")
},
outerClick(){
console.log("outer Click")
},
down(){
console.log("enter")
},
up(){
console.log("up")
},
down2(){
console.log("down")
}
}
})
</script>
</body>
</html>