<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="Scripts/jquery/jquery-1.4.1.min.js"></script>
<title></title>
<script type="text/javascript">
$(document).ready(function () {
// 按钮不可用, 禁用
$('#btnLogin').attr('disabled', 'true');
//// 按钮可用, 启用
//$('#btnLogin').removeAttr('disabled');
});
</script>
</head>
<body>
<input type="button" id="btnLogin" value="登录"/>
</body>
</html>