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>
选择你喜欢的浏览器:
<select id="myList" onchange="myFunction()">
	<option></option>
	<option>Google Chrome</option>
	<option>Firefox</option>  
	<option>Internet Explorer</option>
	<option>Safari</option>
	<option>Opera</option>
</select>
<p>你喜欢的浏览器为: <input type="text" id="demo" size="20"></p>
</form>
<script>
function myFunction() {
    var mylist = document.getElementById("myList");
    document.getElementById("demo").value = mylist.options[mylist.selectedIndex].text;
}
</script>

</body>
</html>
源代码

动行结果
