​x
 
<html>
<body>
​
<img src="/i/eg_planets.jpg" border="0" usemap="#planetmap" alt="Planets" />
​
<map name="planetmap" id="planetmap">
​
<area shape="circle"
coords="180,139,14"
href ="/example/html/venus.html"
target ="_blank"
alt="Venus" />
​
<area shape="circle"
coords="129,161,10"
href ="/example/html/mercur.html"
target ="_blank"
alt="Mercury" />
​
</map>
<br />
​
文档中链接数目是：
<script type="text/javascript">
document.write(document.links.length)
</script>
​
</body>
</html>
​