zoukankan html css js c++ java

js事件再解析

从别人空间摘得http://www.cnblogs.com/yexiaochai/p/3567597.html （强烈建议阅读本文前先看下这篇文章）

这一个例子看懂了就基本都搞清楚了

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <style type="text/css">
        #p {  300px; height: 300px; padding: 10px;  border: 1px solid black; }
        #c {  200px; height: 200px; border: 1px solid red; }
        #sub {  100px; height: 100px; border: 1px solid red; }
    </style>
</head>
<body>
<div id="p">
    parent
    <div id="c">
        child
        <div id="sub">
            sub

        </div>
    </div>
</div>
<script type="text/javascript">

    window.alert = function (msg) {
        console.log(msg);
    };

    var p = document.getElementById('p'),
            c = document.getElementById('c'),
            sub = document.getElementById('sub');

    sub.addEventListener('click', function (e) {
        alert('sub节点冒泡');

    }, false);

    sub.addEventListener('click', function (e) {
        alert('sub节点捕获')

    }, true);

    p.addEventListener('click', function (e) {
        alert('父节点捕获11')

        //e.cancelBubble= true;

    }, true);

    p.addEventListener('click', function (e) {
        alert('父节点冒泡')
    }, false);

    c.addEventListener('click', function (e) {
        alert('子节点捕获');

    }, true);

    c.addEventListener('click', function (e) {
        alert('子节点冒泡');
        //e.stopPropagation();
    }, false);

    p.addEventListener('click', function (e) {
        alert('父节点捕获')

    }, true);

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

其中不管是捕获/处于/冒泡那个阶段，向组织事件进一步传播统一用event.stopPropagation();

ps:奇葩微软的e.cancleBubble= true 测试在ie9以上已经没用了，ie9以上也可以用event.stopPropagation();了

ps2：e.cancleBubble 容易给人造成误解，以为它只是专门用来组织冒泡的！实际上它阻止的事事件三个阶段！！！！

接下来又尝试让所有事件都不捕获呢？

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <style type="text/css">
        #p {  300px; height: 300px; padding: 10px;  border: 1px solid black; }
        #c {  200px; height: 200px; border: 1px solid red; }
        #sub {  100px; height: 100px; border: 1px solid red; }
    </style>
</head>
<body>
<div id="p">
    parent
    <div id="c">
        child
        <div id="sub">
            sub

        </div>
    </div>
</div>
<script type="text/javascript">

    window.alert = function (msg) {
        console.log(msg);
    };

    var p = document.getElementById('p'),
            c = document.getElementById('c'),
            sub = document.getElementById('sub');

    sub.addEventListener('click', function (e) {
        alert('sub节点冒泡');

    }, false);

    sub.addEventListener('click', function (e) {
        alert('sub节点捕获')

    }, false);

    p.addEventListener('click', function (e) {
        alert('父节点捕获11')

        //e.cancelBubble= true;

    }, false);

    p.addEventListener('click', function (e) {
        alert('父节点冒泡')
    }, false);

    c.addEventListener('click', function (e) {
        alert('子节点捕获');

    }, false);

    c.addEventListener('click', function (e) {
        alert('子节点冒泡');
        //e.stopPropagation();
    }, false);

    p.addEventListener('click', function (e) {
        alert('父节点捕获')

    }, false);

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

结果事：

在一种情况：如果上面有一个遮罩呢？三个嵌套的盒子会产生事件吗

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <style type="text/css">
        #p {  300px; height: 300px; padding: 10px;  border: 1px solid black; }
        #c {  200px; height: 200px; border: 1px solid red; }
        #sub {  100px; height: 100px; border: 1px solid red; }
        .float-left{
            position: absolute;
            left: 0;
            top: 0;
             150px;
            height: 100px;
            padding: 10px;
            background-color: royalblue;
            border: 1px solid black;
            opacity:.5;
        }
    </style>
</head>
<body>
<div id="p">
    parent
    <div id="c">
        child
        <div id="sub">
            sub

        </div>
    </div>
</div>

<div class="float-left">
    我会定位了哦~~~
</div>
<script type="text/javascript">

    window.alert = function (msg) {
        console.log(msg);
    };

    var p = document.getElementById('p'),
            c = document.getElementById('c'),
            sub = document.getElementById('sub');

    sub.addEventListener('click', function (e) {
        alert('sub节点冒泡');

    }, false);

    sub.addEventListener('click', function (e) {
        alert('sub节点捕获')

    }, false);

    p.addEventListener('click', function (e) {
        alert('父节点捕获11')

        //e.cancelBubble= true;

    }, false);

    p.addEventListener('click', function (e) {
        alert('父节点冒泡')
    }, false);

    c.addEventListener('click', function (e) {
        alert('子节点捕获');

    }, false);

    c.addEventListener('click', function (e) {
        alert('子节点冒泡');
        //e.stopPropagation();
    }, false);

    p.addEventListener('click', function (e) {
        alert('父节点捕获')

    }, false);

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

答案：点击在遮罩上则没有任何事件产生！！

下面事遮罩上有事件的情况三个嵌套的盒子会产生事件吗

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <style type="text/css">
        #p {  300px; height: 300px; padding: 10px;  border: 1px solid black; }
        #c {  200px; height: 200px; border: 1px solid red; }
        #sub {  100px; height: 100px; border: 1px solid red; }
        .float-left{
            position: absolute;
            left: 0;
            top: 0;
             150px;
            height: 100px;
            padding: 10px;
            background-color: royalblue;
            border: 1px solid black;
            opacity:.5;
        }
    </style>
</head>
<body>
<div id="p">
    parent
    <div id="c">
        child
        <div id="sub">
            sub

        </div>
    </div>
</div>

<div class="float-left">
    我会定位了哦~~~
</div>
<script type="text/javascript">

    window.alert = function (msg) {
        console.log(msg);
    };

    var p = document.getElementById('p'),
            c = document.getElementById('c'),
            sub = document.getElementById('sub');

    sub.addEventListener('click', function (e) {
        alert('sub节点冒泡');

    }, false);

    sub.addEventListener('click', function (e) {
        alert('sub节点捕获')

    }, false);

    p.addEventListener('click', function (e) {
        alert('父节点捕获11')

        //e.cancelBubble= true;

    }, false);

    p.addEventListener('click', function (e) {
        alert('父节点冒泡')
    }, false);

    c.addEventListener('click', function (e) {
        alert('子节点捕获');

    }, false);

    c.addEventListener('click', function (e) {
        alert('子节点冒泡');
        //e.stopPropagation();
    }, false);

    p.addEventListener('click', function (e) {
        alert('父节点捕获')

    }, false);

    var fleft= document.querySelector('.float-left');
    fleft.addEventListener('click', function (e) {
        alert('fleft捕获')
    }, true);
    fleft.addEventListener('click', function (e) {
        alert('fleft冒泡')
    }, false);

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

在点击时候发现：

只有它自己的两个事件产生！！三个嵌套的盒子不会产生事件

所以可以总结：事件的分阶段传播，是当有盒子嵌套时候才会发生！！我们这个fleleft元素内层没有元素，外层为body，所有不会影响那三个嵌套的盒子！

别人的博客链接：http://www.cnblogs.com/yexiaochai/p/3567597.html

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原文地址：https://www.cnblogs.com/WhiteHorseIsNotHorse/p/6295022.html