W3School TIY
编辑您的代码：
<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>
查看结果: