<!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>