<!DOCTYPE html>
<html>
<head>
<title>下滑线跟随导航</title>
<meta charset="utf-8"/>
<script type="text/javascript" src="jquery-3.3.1.js"></script>
<style type="text/css">
*{padding:0;margin:0;}
ul {list-style: none;z-index:20;position:relative;font-size: 15px;}
li {float:left;cursor:pointer;width:100px;height: 30px;text-align:center;line-height:30px;color: #fff;font-weight: bold;}
.menu{width:500px;position:relative;margin:20px auto;height:32px;box-shadow: 0 2px 20px #000;background: #AF3434;border-radius:3px }
</style>
<script type="text/javascript">
$(function(){
$('li').hover(function(){
$x=parseInt($(this).attr('name'))*100;
$('.block').stop().animate({left:$x+'px'},100);
},function(){
$('.block').stop().animate({left:'0px'},100);
}
)
})
</script>
</head>
<body>
<div class="menu">
<ul>
<li name="0">首页</li>
<li name="1">php中文网</li>
<li name="2">独孤九剑</li>
<li name="3">西门大官人</li>
<li name="4">灭绝师太</li>
</ul>
<div class="block" style="z-index:10;width:100px;height:2px;background:#fff;position:absolute;top:30px;"></div>
</div>
</body>
</html>