同一个盒子，同时绑定事件冒泡与事件捕获两个事件

当同一个容器绑定两个事件，遵循先捕获，后冒泡，有一个前提是点击的事件先执行

<!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>
    <style>
        .box{
            width: 300px;
            height: 300px;
            background: red;
        }
        .content{
            width: 200px;
            height: 200px;
            background: green;
        }
        .wrapper{
            width: 100px;
            height: 100px;
            background: yellow;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="content">
            <div class="wrapper">
            </div>
        </div>
    </div>
    <script>
        let box = document.getElementsByClassName("box")[0];
        let content = document.getElementsByClassName("content")[0];
        let wrapper = document.getElementsByClassName("wrapper")[0];
        wrapper.addEventListener('click',function(){
            console.log('wrapper')
        },true)
        content.addEventListener('click',function(){
            console.log('content')
        },true)
        box.addEventListener('click',function(){
            console.log('box')
        },true)
        wrapper.addEventListener('click',function(){
            console.log('wrapperBubble')
        },false)
        content.addEventListener('click',function(){
            console.log('contentBubble')
        },false)
        box.addEventListener('click',function(){
            console.log('boxBubble')
        },false)
    </script>
</body>
</html>

调换位置，冒泡的处理事件在前

<!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>
    <style>
        .box{
            width: 300px;
            height: 300px;
            background: red;
        }
        .content{
            width: 200px;
            height: 200px;
            background: green;
        }
        .wrapper{
            width: 100px;
            height: 100px;
            background: yellow;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="content">
            <div class="wrapper">
            </div>
        </div>
    </div>
    <script>
        let box = document.getElementsByClassName("box")[0];
        let content = document.getElementsByClassName("content")[0];
        let wrapper = document.getElementsByClassName("wrapper")[0];
        wrapper.addEventListener('click',function(){
            console.log('wrapperBubble')
        },false)
        content.addEventListener('click',function(){
            console.log('contentBubble')
        },false)
        box.addEventListener('click',function(){
            console.log('boxBubble')
        },false)
        wrapper.addEventListener('click',function(){
            console.log('wrapper')
        },true)
        content.addEventListener('click',function(){
            console.log('content')
        },true)
        box.addEventListener('click',function(){
            console.log('box')
        },true)

    </script>
</body>
</html>

来源：CSDN

作者：小小飞肖

链接：https://blog.csdn.net/qq_32766999/article/details/101195839

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