Js_CSS实现多色表格
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<style rel="stylesheet" type="text/css">
.bg1 {
	BACKGROUND: plum 0% 50%
}
.bg2 {
	BACKGROUND: thistle 0% 50%
}
.bg3 {
	BACKGROUND: aquamarine 0% 50%
}
</style>
<script>
//指定各行css样式	
function changeRowCss(){
	var table = document.getElementById("testRowsColor");
	var rowclass=table.getAttribute("rowclass");
	if(rowclass){							 	
		var bgCssArr=rowclass.split(",");//背景色的Css名称数组
		if(bgCssArr.length>0){
			rows = table.rows;
			for (var j=0; j<rows.length; j++) {
			   var sn=j % (bgCssArr.length);
			   rows[j].className=bgCssArr[sn];
			}
		}
	}
}
</script>
</HEAD>
<BODY>
  <table id="testRowsColor"  rowclass=",bg1,bg2,bg3" width="200px" >
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>
		<tr>呵呵</tr>				
  </table>
 </BODY>
 <script>changeRowCss();</script>
</HTML>