​x
 
<html>
<body>
​
<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>
​
<p>noHref 状态：
<script type="text/javascript">
x=document.getElementById('venus');
document.write(x.noHref);
</script>
</p>
​
</script>
</body>
</html>
​