​x
 
<!DOCTYPE html>
<html>
<body>
​
<img src ="/i/eg_planets.jpg"
alt="Planets"
usemap ="#planetmap" />
​
<map name ="planetmap">
<area shape ="circle" coords ="180,139,14"
href ="/example/hdom/venus.html" id="venus" 
target="_self"/>
</map>
​
<p>单击按钮可返回图像映射中“venus”区域的 target 属性值。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("venus").target;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​