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Area port 属性
tryjsref_area_port
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<!DOCTYPE html> <html> <body> <img src="/demo/images/planets.gif" width="145" height="126" usemap="#planetmap"> <map name="planetmap"> <area id="venus" shape="circle" coords="124,58,8" alt="Venus" href="/demo/venus.htm"> </map> <p>Click the button to display the port of the href attribute for the "venus" area in the image-map.</p> <p><b>Note:</b> If the port part is not specified in the URL, or is 80 (which is default), some browsers will just display 0 or nothing.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("venus").port; document.getElementById("demo").innerHTML = "Port: " + x; } </script> </body> </html>