JS当页换图片（分析href所给的信息）

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
  <meta http-equiv="content-type" content="text/html; charset=utf-8" />
  <title>Image Gallery</title>
    <script type="text/javascript" src="scripts/showPic.js"></script>
</head>
<body>
  <h1>Snapshots</h1>
  <ul>
    <li>
      <a href="images/fireworks.jpg" title="A fireworks display" onclick="showPic(this); return false;">Fireworks</a>
    </li>
    <li>
      <a href="images/coffee.jpg" title="A cup of black coffee" onclick="showPic(this); return false;">Coffee</a>
    </li>
    <li>
      <a href="images/rose.jpg" title="A red, red rose" onclick="showPic(this); return false;">Rose</a>
    </li>
    <li>
      <a href="images/bigben.jpg" title="The famous clock" onclick="showPic(this); return false;">Big Ben</a>
    </li>
  </ul>
  <img id="placeholder" src="images/placeholder.gif" alt="my image gallery" />
  <p id="description">Choose an image.</p>
</body>
</html>

showPic.js文件

function showPic(whichpic) {
  var source = whichpic.getAttribute("href");
  var placeholder = document.getElementById("placeholder");
  placeholder.setAttribute("src",source);
  var text = whichpic.getAttribute("title");
  var description = document.getElementById("description");
  description.firstChild.nodeValue = text;
}

JQuery的图片切换效果要漂亮很多：
http://www.cnblogs.com/lhb25/p/50-jquery-plugins-f.html
http://tympanus.net/Development/ImageTransitions/

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原文地址：https://www.cnblogs.com/findumars/p/3164224.html