css expression 隔行换色

答案：css实现的，用expression但在实际中部建议使用，占用资源而且firefox浏览器不支持
<style>  
.db tr{  
background-color:expression('#000000,#333333,#555555,#777777,#999999,#bbbbbb,#dddddd,#ffffff'.split(',')[rowIndex%8]);  
}  
</style>  
<table width="500" border="1" class="db">  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
<tr>  
<td> </td>  
</tr>  
</table>

  [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]

就两颜色的时候可以改这这样 
<style> 
.db tr{ 
background-color:expression('#abcdef,#123456'.split(',')[rowIndex%2]); 
} 
</style> 

<style> 
.db { border-collapse:collapse;} 
.db tr{ background-color:expression('#F8F8F8,#EFEFEF'.split(',')[rowIndex%2]); } 
</style> 
<table width="100%" border="1" class="db"> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
</table> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
<tr> 
<td> </td> 
</tr> 
</table>

  [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]

如果真想用，可以用下面的js写的
<table id="list" width="300"> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
    </tr> 
 </table> 
 <script type="text/javascript"> 
 <!-- 
 var colorArr = new Array("#ffffff","#cccccc","#999999","#666666","#333333"); 
 var s = 0; 
 function listDoodle() {     
    var list = document.getElementById("list").getElementsByTagName("tr"); 
    for (var i=0;i<list.length ;i++ ) 
    { 
        list[i].style.backgroundColor = colorArr[s++]; 
        if (s==(colorArr.length-1)) 
        { 
            s = 0; 
        } 
    } 
 } 
 window.onload = listDoodle; 
 //--> 
 </script>

  [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]

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