tryjsref_optgroup_get 在线代码实例

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<!DOCTYPE html>
<html>
<body>
<h3>访问 OPTGROUP 元素</h3>
<select size="4">
  <optgroup id="myOptgroup" label="Swedish Cars">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="koenigsegg">Koenigsegg</option>
  </optgroup>
</select>
<p>点击按钮获取选项组的标签/描述。</p>
<p id="demo"></p>
<button onclick="myFunction()">尝试一下</button>
<script>
function myFunction()
{
var x = document.getElementById("myOptgroup").label;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>
 
 
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运行结果
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