//前提是你要导入jquery的库
$(function(){
$("#tab tbody tr:odd").css("backgroundColor","red"); //奇数行
$("#tab tbody tr:even").css("backgroundColor","red"); //偶数行
$("#tab tbody tr:eq(2)").css("backgroundColor","red"); //索引等于2
$("#tab tbody tr:gt(2)").css("backgroundColor","red"); //索引大于2
$("#tab tbody tr:lt(2)").css("backgroundColor","red"); //索引小于2
});
html代码
<table id="tab" border="1" cellpadding="0" cellspacing="0" width="70%">
<tbody>
<tr>
<td>a</td><td>a</td><td>a</td><td>a</td>
</tr>
<tr>
<td>b</td><td>b</td><td>b</td><td>b</td>
</tr>
<tr>
<td>c</td><td>c</td><td>c</td><td>c</td>
</tr>
<tr>
<td>d</td><td>d</td><td>c</td><td>c</td>
</tr>
</tbody>
</table>
