disabled 属性可设置或返回是否禁用确认按钮
submitObject.disabled=true|false
下面的例子会在单击确认按钮时将其禁用：
<html>
<head>
<script type="text/javascript">
function disableButton()
{
document.getElementById("submit1").disabled=true
}
</script>
</head>
<body>
<form>
<input type="submit" id="submit1" onclick="disableButton()" />
</form>
</body>
</html>