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运行代码 
<!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>
<div class="w3-container">
    <h2>W3.CSS模式图像库</h2>
    <p>单击图像以完整尺寸显示它们。</p>
</div>
<div class="w3-row-padding">
    <div class="w3-container w3-third">
        <img src="https://atts.w3cschool.cn/img_snowtops.jpg" style="width:100%;cursor:pointer"
             onclick="onClick(this)" class="w3-hover-opacity">
    </div>
    <div class="w3-container w3-third">
        <img src="https://atts.w3cschool.cn/img_lights.jpg" style="width:100%;cursor:pointer"
             onclick="onClick(this)" class="w3-hover-opacity">
    </div>
    <div class="w3-container w3-third">
        <img src="https://atts.w3cschool.cn/img_mountains.jpg" style="width:100%;cursor:pointer"
             onclick="onClick(this)" class="w3-hover-opacity">
    </div>
</div>
<div id="modal01" class="w3-modal" onclick="this.style.display='none'">
    <span class="w3-button w3-hover-red w3-xlarge w3-display-topright">&times;</span>
    <div class="w3-modal-content w3-animate-zoom">
        <img id="img01" style="width:100%">
    </div>
</div>
<script>
 
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运行结果
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