源代码:
<!DOCTYPE html> <html> <body> <img src="/statics/images/course/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>金星区域的 protocol: <script> document.write(document.getElementById('venus').protocol); </script> </p> </body> </html>
运行结果：