代码示例：（标识：hdom_area_search）
<!DOCTYPE html>
<html>
<body>
<img src="/static/demo/images/eg_planets.gif"
width="145" height="126"
usemap="#planetmap" />
<map name="planetmap">
<area id="venus" shape="circle"
coords="124,58,8"
alt="Venus"
href="/static/demo/html/venus.html?id=venus" />
</map>
<p>单击按钮以显示“venus”区域的 href 属性的查询字符串部分。</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("venus").search;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>
