<!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">
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
ul{margin:0padding:0list-style:nonedisplay:blockwidth:300px}
.l1{float:leftwidth:150pxoverflow:hidden}
.r2{float:left}
</style>
</head>
<body>
<ul>
<li class="l1">11111111</li>
<li class="r2">aaaaaaa</li>
<li class="l1">222222</li>
<li class="r2">bbbbbbb</li>
<li class="l1">33333</li>
<li class="r2">ddddddd</li>
<li style="clear:both"></li>
</ul>
</body>
</html>
根据要求改改,不懂的再向我提问
楼主写的是正确的哦,楼主的写法表示hover时颜色设置为#222222未访问过的样式 :link
已经点击过的样式 :visited
鼠标悬停时的样式 :hover
鼠标按下时的样式 :active