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<!DOCTYPE html> <html> <body> <h1>演示如何访问 MAP 元素</h1> <img src="/i/html/planets.jpg" width="215" height="260" usemap="#myMap"> <map id="myMap" name="myMap"> <area shape="rect" coords="0,0,110,260" alt="Sun" href="/demo/html/sun.htm"> <area shape="circle" coords="129,161,10" alt="Mercury" href="/demo/html/mercur.html"> <area shape="circle" coords="180,139,14" alt="Venus" href="/demo/html/venus.html"> </map> <p>单击该按钮可获取图像映射中 area 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>