[javascript]代码库
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
	<title></title>
	<style type="text/css">
	ul{width:100px;}
	li{list-style:none;float:left;width:50px;height:25px;}
	</style>
	<script type="text/javascript">
function t(){
	var a=document.getElementsByTagName('li');
	var id=0;
	for(var i=0;i<a.length;i++){
		id=i+1;
		if(Math.ceil(id/2)%2){
			a[i].style.background='red';
		}else{
			a[i].style.background='pink';
		}
	}
}
	</script>
</head>
<body onload="t();">
	<div>
		<ul>
			<li>1</li>
			<li>2</li>
			<li>3</li>
			<li>4</li>
			<li>5</li>
			<li>6</li>
		</ul>
	</div>
</body>
</html>