tryjsref_optgroup_create 在线代码实例

实例代码( Tip: 登录后体验更佳 )
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<!DOCTYPE html>
<html>
<body>
<p>点击按钮创建 OPTGROUP 元素。</p>
<button onclick="myFunction()">尝试一下</button>
<select id="mySelect" size="6">
<option>BMW
<option>Mercedes
<option>Ford
<option>Volvo
<option>Toyota
</select>
<script>
function myFunction()
{
var x = document.getElementById("mySelect");
var y = document.createElement("OPTGROUP");
y.setAttribute("label", "SwedishCars");
y.appendChild(x.options[3])
x.insertBefore(y,x.options[3]);
}
</script>
</body>
</html>
 
 
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运行结果
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