使用事件委托清除事件冒泡

最新推荐文章于 2022-03-05 09:48:12 发布

原创最新推荐文章于 2022-03-05 09:48:12 发布 · 1.4k 阅读

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文章标签：

#清楚冒泡 #事件委托 #javascript

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1.先看看常见的一种清除事件冒泡方法

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        #upper{
            width: 300px;
            height: 300px;
            background: red;
        }
        #center{
            width: 200px;
            height: 200px;
            background: aqua;
        }
        #lower{
            width: 100px;
            height: 100px;
            background: yellow;
        }
    </style>
</head>
<body>
<div id="upper">
    <div id="center">
        <div id="lower"></div>
    </div>
</div>
<script>
    var upper = document.getElementById('upper');
    var center = document.getElementById('center');
    var lower = document.getElementById('lower');
    upper.onclick = function (ev) {
        console.log('外');
    };
    center.onclick = function (ev) {
      console.log('中');
        ev.stopPropagation();
    };
    lower.onclick = function (ev) {
        console.log('内');
        ev.stopPropagation();
    };
</script>
</body>
</html>

2.使用事件委托

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        body{
            background: antiquewhite;
        }
        #upper{
            width: 300px;
            height: 300px;
            background: red;
        }
        #center{
            width: 200px;
            height: 200px;
            background: aqua;
        }
        #lower{
            width: 100px;
            height: 100px;
            background: yellow;
        }
    </style>
</head>
<body>
<div id="upper">
    <div id="center">
        <div id="lower"></div>
    </div>
</div>
<script>
    var upper = document.getElementById('upper');
    var center = document.getElementById('center');
    var lower = document.getElementById('lower');

    var body = document.getElementsByTagName('body')[0];
    body.onclick = function (ev) {
        var ev = ev||window.event;
        var target = ev.target||ev.srcElement;
        switch (target.id){
            case 'upper':
                console.log('外');
                break;
            case 'center':
                console.log('中');
                break;
            case 'lower':
                console.log('内');
                break;
        }
    };
</script>
</body>
</html>