摘自： javascript DOM 编程艺术
1. 在一个网页上切换显示不同的图片
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Image Gallery</title>
<script type="text/javascript" src="script/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 a image.</p>
</body>
</html>
showPic.js
function showPic(whichpic) {
var source = whichpic.getAttribute("href");
var placeholder = document.getElementById("placeholder");
placeholder.setAttribute("src",source);
}
2.在同一个网页上切换显示不同的文本
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;
}