jquery下划线跟随导航
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript" src="jquery-3.4.0.min.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 #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'},250)
},
function(){
$('.block').stop().animate({left:'0px'},250)
}
)
})
</script>
</head>
<body>
<div class="menu">
<ul>
<li name="0">首页</li>
<li name="1">php</li>
<li name="2">js</li>
<li name="3">jq</li>
<li name="4">css</li>
</ul>
<div class="block" style="z-index:10;width:100px;height:2px;background:#fff;position:absolute;top:30px;"></div>
</div>
</body>
</html>