基于JS与CSS实现的简洁网页滑动Tab菜单

<!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>
<title>网页滑动门菜单</title>
<style>
* {list-style-type:none; font-size:12px; text-decoration:none; margin:0; padding:0;}
.tab{ margin:20px; width:244px; height:200px; overflow:hidden; border:1px #AACCEE solid;}
.tab_b{ overflow:hidden; margin:5px; }
.menu{overflow:hidden; }
.menu li{ display:block; float:left; display: list-item; text-align:center; width:60px; background-color:#EDF4FC;line-height:20px; border-bottom:1px #AACCEE solid;border-right:1px #AACCEE solid; }
.menu li a{ display:block;}
.menu_d{border-bottom:1px #FFFFFF solid;background-color:#FFFFFF; }
.tab ul li.aaa{background: #FFFFFF;border-bottom:0px #FFFFFF solid;}
</style>
</head>
<body>
<script language="javascript">
function tabs(n)
{
var len = 4;
for (var i = 1; i <= len; i++)
{
document.getElementById('tab_a' + i).style.display = (i == n) ? 'block' : 'none';
document.getElementById('tab_' + i).className = (i == n) ? 'aaa' : 'none';
}
}
</script>
<div class="tab">
<ul class="menu" id="menutitle">
<li id="tab_1" class="aaa"><a href="javascript:void(0)" onclick="tabs('1');" >新闻</a></li>
<li id="tab_2" ><a href="javascript:void(0)" onmouseover="tabs('2');" >生活</a></li>
<li id="tab_3" ><a href="javascript:void(0)" onmouseover="tabs('3');" >滚动</a></li>
<li id="tab_4" ><a href="javascript:void(0)" onmouseover="tabs('4');" >旅游</a></li>
</ul>
<div class="tab_b" id="tab_a1" style="display:block;"> 国内国际新闻</div>
<div class="tab_b" id="tab_a2" style="display:none;">本土快乐生活</div>
<div class="tab_b" id="tab_a3" style="display:none;">适时新闻滚动</div>
<div class="tab_b" id="tab_a4" style="display:none;">期待完美假日</div>
</div>
</body>
</html>