<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link href="StyleSheet.css" rel="stylesheet" type="text/css" />
<script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(onLoad());
function onLoad() {
alert($("#wcontrol_subtable0").attr('id'));
}
</script>
<title></title>
</head>
<body>
<form name="form1" method="post" action="Default.aspx" id="form1">
<div id="wcontrol_pnlMenu">
<table border="0">
<tr>
<td>
<table id="wcontrol_subtable0" class="class1" cellspacing="0" cellpadding="0" border="0"
style="border-collapse: collapse;">
<tr id="wcontrol_subtable0_th">
<th>
Parameters
</th>
</tr>
<tr>
<td>
</td>
</tr>
</table>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
看起来很正常,问题是警报方法出现“null”!!!!我不知道这里到底发生了什么。