不多说了，直接给代码
代码
<html>
<head>
<title>双色表格</title>
<style type="text/css">
<!--
table {
border:solid 1px black;
text-align:center;
border-spacing:0px;
}
th,td {
border:solid 1px black;
width:100px;
}
-->
</style>
<script src="lib/jquery.js" type="text/javascript"></script>
<script type="text/javascript" >
$().ready(function() {
$('tr:has(th)').css('background','violet'); //表格标题
$('tr:even:gt(0)').css('background','yellow'); //偶数行,且行数大于0(即标题)
$('tr:odd').css('background','olive'); //奇数行
});
</script>
</head>
<body>
<center>
<table>
<tr id="th">
<th>姓名</th>
<th>科目</th>
<th>成绩</th>
</tr>
<tr>
<td>张三</td>
<td>语文</td>
<td>90</td>
</tr>
<tr>
<td>张三</td>
<td>数学</td>
<td>87</td>
</tr>
<tr>
<td>李四</td>
<td>数学</td>
<td>68</td>
</tr>
<tr>
<td>王五</td>
<td>英语</td>
<td>76</td>
</tr>
</table>
</center>
</body>
</html>