下拉菜单
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
* {
margin: 0;
padding: 0;
list-style: none;
}
.nav{
width: 800px;
height: 64px;
margin: 0 auto;
background: green;
}
.first{
display: flex;
}
.first>li{
border: 1px solid black;
height: 64px;
line-height: 64px;
flex: 1;
text-align: center;
}
.first>li:hover{
background-color: red;
}
.sec {
border: 1px solid black;
display: none;
}
.sec li{
background: pink;
}
.sec li:hover{
background: gray;
}
</style>
</head>
<body>
<div class="nav">
<ul class="first">
<li>一级菜单
<ul class="sec">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
<li>一级菜单
<ul class="sec">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
<li>一级菜单
<ul class="sec">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
<li>一级菜单
<ul class="sec">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
<li>一级菜单
<ul class="sec">
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
<li>二级菜单</li>
</ul>
</li>
</ul>
</div>
<script src="jquery-3.1.1.js"></script>
<script>
$('.first>li').hover(function(){
$(this).children('ul').stop().slideToggle();
})
</script>
</body>
</html>
