CSS 样式的简单行颜色交替

<style>
.db { border-collapse:collapse;}
.db tr{ background-color:expression('#dbdbdb,#EFEFEF'.split(',')[rowIndex%2]); }
.db tr th{background-color:red}
</style>
<table width="100%" border="1" class="db">
<tr>
<th class="myth">&nbsp;</th>
</tr>
<tr>
<td>&nbsp;</td>
</tr>
<tr>
<td>&nbsp;</td>
</tr>
<tr>
<td>&nbsp;</td>
</tr>
<tr>
<td>&nbsp;</td>
</tr>
<tr>
<td>&nbsp;</td>
</tr>
<tr>
<td>&nbsp;</td>
</tr>
<tr>
<td>&nbsp;</td>
</tr>
<tr>
<td>&nbsp;</td>
</tr>
<tr>
<td>&nbsp;</td>
</tr>
</table>