W3School TIY Editor
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<!DOCTYPE html> <html> <body> <img src="/i/html/planets.jpg" width="215" height="260" usemap="#planetmap"> <map name="planetmap"> <area id="venus" shape="circle" coords="180,139,14" alt="Venus" href="/demo/tags/venus.html"> </map> <p>单击按钮可返回图像映射中“金星”区域的形状。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("venus").shape; document.getElementById("demo").innerHTML = x; } </script> </body> </html>