<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jQuery实现导航栏</title>
<style> *{ padding:0; margin:0;
} #navigation>ul{ list-style: none;
} #navigation>ul>li{ float: left; width: 80px; height: 30px; background: #009f95; color: #ffffff; text-align: center; line-height: 30px; cursor:pointer;
} #navigation>ul>li:hover{ background:#0B61A4;
} #navigation>ul>li>a{ color:#fff; text-decoration:none;
} #navigation>ul>li>ul{ display:none;
} #navigation>ul>li>ul>li{ background: #00B83F; list-style: none;
} #navigation>ul>li>ul>li:hover{ background: #1E9FFF;
} #navigation>ul>li>ul>li>a{ color:#fff; text-decoration: none;
}
</style>
</head>
<body>
<div id="navigation">
<ul>
<li>
<a href="">1</a>
<ul>
<li><a href="">11</a></li>
<li><a href="">13</a></li>
<li><a href="">14</a></li>
</ul>
</li>
<li>
<a href="">2</a>
<ul>
<li><a href="">21</a></li>
<li><a href="">22</a></li>
<li><a href="">23</a></li>
</ul>
</li>
<li>
<a href="">3</a>
</li>
</ul>
</div>
<script src="../js/vendor/jquery-3.2.1.min.js"></script>
<script> $("#navigation>ul>li:has(ul)").hover(function(){ //show
$(this).children('ul').stop().slideDown(); },function(){ //hide
$(this).children('ul').stop().slideUp(); }) </script>
</body>
</html>
