W3School TIY Editor
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<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>