tryjsref_map_get 在线代码实例

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<h3>以下实例演示了如何访问  MAP 元素</h3>
<img src="/statics/images/course/planets.gif" width="145" height="126" alt="Planets" usemap="#planetmap">
<map name="planetmap" id ="myMap">
  <area shape="rect" coords="0,0,82,126" target="_blank" alt="Sun" href="/statics/images/course/sun.gif">
  <area shape="circle" coords="90,58,3" target="_blank" alt="Mercury" href="/statics/images/course/merglobe.gif">
  <area shape="circle" coords="124,58,8" target="_blank" alt="Venus" href="/statics/images/course/venglobe.gif">
</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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