host 属性可设置或返回 URL 的主机名和端口。
areaObject.host=host
下面的例子可返回 "Venus" 区域的主机名和端口:
<html> <body> <img src="planets.gif" width="145" height="126" usemap="#planetmap" /> <map name="planetmap"> <area id="venus" shape="circle" coords="124,58,8" alt="Venus" href="venus.htm" /> </map> <p>The hostname and port for the "Venus" area are: <script type="text/javascript"> x=document.getElementById('venus'); document.write(x.host); </script> </p> </body> </html>