try_w3examples_157 在线代码实例

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<!DOCTYPE html>
<html>
<head>
    <title>W3.CSS(w3cschool.cn)</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
    <link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
</head>
<body>
<div class="w3-container">
    <h2>悬停图片</h2>
    <p>当您将鼠标移到图像上时，w3-hover-opacity类将为图像添加透明度：</p>
    <img src="https://atts.w3cschool.cn/img_snowtops.jpg" class="w3-hover-opacity" alt="Norway" style="width:50%">
    <p>当您将鼠标移到图像上时，w3-hover-opacity-off类会重新显示图像的透明度：</p>
    <img src="https://atts.w3cschool.cn/img_snowtops.jpg" class="w3-opacity w3-hover-opacity-off" alt="Norway" style="width:50%">
</div>
</body>
</html>
 
 
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运行结果
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