在一个表格中找到最大值和最小值，请帮忙！！！！！
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script type="text/javascript" src="JQuery/jquery-1.10.1.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$(".red_one",this).each(function() {
var num = parseInt(this.innerHTML);
alert(num);
});
});
</script>
</head>
<body>
<table width="500" border="1" cellspacing="0" cellpadding="0">
<tr>
<td class="red_one">01</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="red_one">04</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="red_one">09</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
</body>
</html>
jQuery
JavaScript