​x
 
<html>
<head>
<script type="text/javascript">
function changeLink()
{
document.getElementById('venus').href="http://www.w3school.com.cn"
}
</script>
</head>
<body>
​
<p>请点击金星（Venus）：</p>
<img src="/i/eg_planets.jpg" 
usemap="#planetmap" />
​
<map name="planetmap">
<area
id="venus"
shape="circle"
coords="180,139,14"
href ="/example/html/venus.html"
alt="Venus" />
</map>
​
<input type="button" onclick="changeLink()" value="改变链接" />
​
</body>
</html>
​