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How to implement Html event bubbling

一个新手
一个新手Original
2017-10-12 10:33:171738browse

I originally thought that span was different from input, and event bubbling would be swallowed up by the parent tag. I wrote a demo to test event bubbling, but found that it was not what I thought. In addition: event.stopPropagation() and event.stopImmediatePropagation() cannot prevent span from bubbling into the a tag, but the simple and crude return false can. 


<!DOCTYPE html>
<html>
<head>
    <title>Bubbling</title>
    <style type="text/css">
        * {
            font-size:30px;
        }
        div {
            border: 1px blue solid;
        }
        span {
            border: 1px blue solid;
        }
    </style>
    <script type="text/javascript">
        function setforeColor(sender) {
            sender.style.color = "red";
        }

        function setbgColor(sender) {
            sender.style.background = "green";
            return false;
        }
    </script>
</head>
<body>
    <div>
        <span onclick="setforeColor(this)">span tag</span> in div
    </div>
    <br>
    <div>
        <input type="button" value="Button" onclick="setforeColor(this)"/> in div
    </div>
    <br>
    <a href="https://www.baidu.com" style="text-decoration:none;display:block;">
        <span onclick="setforeColor(this);return false">span tag</span> in anchor
    </a>
    <br>
    <a href="https://www.baidu.com" style="text-decoration:none;display:block;">
        <span onclick="setbgColor(this)">span tag</span> in anchor
    </a>
</body>
</html>

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