<html>
<body>
<img src="/img/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>
<p>"Venus" 区域的 hostname 和 port 是：
<script type="text/javascript">
x=document.getElementById('venus');
document.write(x.host);
</script>
</p>
</body>
</html>