在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(cainiaoplay.com)</title>
</head>		
<body>

<form>
<select id="pets">
    <option>Cats</option>
    <option>Dogs</option>
</select>
</form>
<p>单击下面的按钮禁用下拉列表。</p>
<button onclick="disableElement()">禁用下拉列表</button>
<script>
function disableElement(){
	document.getElementById("pets").disabled=true;
}

</script>
</body>
</html>

源代码

动行结果