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<!DOCTYPE html> <html> <body> <h3>如何访问 MAP 元素的演示</h3> <img src="planets.gif" width="145" height="126" alt="行星"usemap="#myMap"> <map id="myMap" name="myMap"> <area shape="rect" coords="0,0,82,126" alt="太阳" href="sun.htm"> <area shape="circle" coords="90,58,3" alt="水星" href="mercur.htm"> <area shape="circle" coords="124,58,8" alt="金星" href="venus.htm"> </map> <p>单击该按钮可获取图像映射中区域元素的数量。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myMap").areas.length; document.getElementById("demo").innerHTML = x; } </script> </body> </html>