fmpq.com
源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> <h3>以下实例演示了如何访问 MAP 元素</h3> <img src="planets.gif" width="145" height="126" alt="Planets" usemap="#myMap"> <map id="myMap" name="myMap"> <area shape="rect" coords="0,0,82,126" alt="Sun" href="sun.htm"> <area shape="circle" coords="90,58,3" alt="Mercury" href="mercur.htm"> <area shape="circle" coords="124,58,8" alt="Venus" href="venus.htm"> </map> <p>点击按钮来获取图像地图中 area 元素的数目。</p> <p id="demo"></p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ var x = document.getElementById("myMap").areas.length; document.getElementById("demo").innerHTML = x; } </script> </body> </html>
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