Vue中的事件修饰符：
- prevent：阻止默认事件
- stop：阻止事件冒泡
- once：事件只触发一次
- capture：使用事件捕获模式
- self：只有event.target是当前元素时触发
- passive：事件的默认行为立即执行，不需要等待回调函数执行完成
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>modifier</title>
<script type="text/javascript" src="../js/vue.js"></script>
<style type="text/css">
* {
margin: 10px;
}
</style>
</head>
<body>
<div class="root">
<span>prevent修饰符：</span>
<div style="background-color: skyblue">
<h1>姓名：{{name}}</h1>
<a href="https:www.baidu.com" @click="showMsg">不使用prevent修饰符，页面跳转至百度</a><br>
<!--使用 prevent 修饰符，相当于原生js中的event.preventDefault();-->
<a href="https:www.baidu.com" @click.prevent="showMsg">使用prevent修饰符，页面不跳转</a>
</div>
<span>stop修饰符：</span>
<div @click="showMsg2" style="background-color: skyblue">
最外层
<div @click.stop="showMsg2" style="background-color: yellow">
中间层
<!--使用 stop 修饰符，相当于相当于原生js中的event.stopPropagation();-->
<button @click.stop="showMsg2">内层按钮</button>
</div>
</div>
<span>once 修饰符：</span>
<div style="background-color: yellowgreen">
<button @click.once="showMsg3">点击弹窗</button>
</div>
<span>capture 修饰符：</span>
<span>不加 capture</span>
<div @click="showMsg4(‘外层div‘)" style="background-color: skyblue">
最外层
<div @click="showMsg4(‘内层div‘)" style="background-color: yellow">
中间层
<button @click="showMsg4(‘按钮‘)">内层按钮</button>
</div>
</div>
<span>中间层div添加capture</span>
<div @click="showMsg4(‘最外层div‘)" style="background-color: skyblue">
最外层
<div @click.capture="showMsg4(‘中间层div‘)" style="background-color: yellow">
中间层
<button @click="showMsg4(‘按钮‘)">内层按钮</button>
</div>
</div>
<span>self 修饰符：</span>
<span>中间层div添加self，点击按钮时，不触发中间层div的点击事件</span>
<div @click="showMsg5($event,‘最外层div‘)" style="background-color: skyblue">
最外层
<div @click.self="showMsg5($event,‘中间层div‘)" style="background-color: yellow">
中间层
<button @click="showMsg5($event,‘按钮‘)">内层按钮</button>
</div>
</div>
</div>
<script type="text/javascript">
Vue.config.productionTip = false;//关闭生产提示
let person = {
name: "张三",
age: 18,
};
const vm = new Vue({
el: ".root",
data: person,
methods: {
showMsg(event) {
// event.preventDefault();
alert("你好," + this.name);
},
showMsg2(event) {
// event.stopPropagation();
alert("默认会弹多次，使用stop只弹一次");
},
showMsg3() {
alert("默认点击就弹窗，使用once只在第一次点击弹窗");
},
showMsg4(sign) {
alert(sign + "绑定的事件触发");
},
showMsg5(event,sign) {
alert(event.target);
alert(sign + "绑定的事件触发");
}
}
});
</script>
</body>
</html>