<html>
<body>
<input value="OK">
<p id="demo">�����ť�����ð�ť�� type ���ԡ�</p>
<button onclick="myFunction()">��һ��</button>
<script>
function myFunction()
{
document.getElementsByTagName("INPUT")[0].setAttribute("type","button");
}
</script>
<p>Internet Explorer 8 �Լ�����İ汾��֧�ִ˷�����</p>
</body>
</html>