摘要：<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>导航</title> <script src="https://code.jquery.com/jquery-3.3.1.min.js&
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>导航</title>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<style type="text/css">
*{margin: 0px;padding: 0px;}
li{list-style: none;}
.ss{position: relative;}
/*.nav{width: 1200px;height: 36px;background-color: #333333;line-height: 36px;font-size: 14px;margin: 20px auto 0px;}
.nav>ul>li{float: left;margin-left: 18px;padding: 0 6px;}
.nav>ul>li>a{text-decoration: none;color: #fff;display: block;padding: 0 6px;border: 1px solid #333333;height: 34px;}
.nav>ul>li>a:hover{color: #2d8930;background-color: #fff;height: 34px;display: block;border: 1px solid #2d8930;padding: 0 6px;}*/
.nav{width: 1200px;height: 36px;background-color: #333333;line-height: 36px;font-size: 14px;margin: 20px auto 0px;}
.nav>ul>li{float: left;width: 82px;text-align: center;height: 34px;margin-left: 18px;}
.nav>ul>li>a{text-decoration: none;color: #fff;}
.nav>ul>li>a:hover{color: #2d8930;background-color: #fff;display: block;border: 1px solid #2d8930;height: 34px;}
.nav_b {width: 268px;border: 1px solid #2d8930;border-top: none;position: absolute;top:36px;}
.nav_b li{float: left;margin-left: 10px;}
.nav_b li a{display: inline-block;border:none;height: 34px;padding: 0px 10px;color: #333;font-size: 12px;}
.nav_b li a:hover{color: #2d8930;border:none;height: 34px;text-decoration:underline;font-size: 12px;}
</style>
<script type="text/javascript">
$(function(){
$(".nav_b").hide()
$(".nav>ul>li").mouseover(function(){
$(this).find('.nav_b').slideDown(500)
})
$(".nav>ul>li").mouseleave(function(){
$(this).find(".nav_b").slideUp(500)
})
})
</script>
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<div class="nav">
<ul>
<li><a href="/">首页</a></li>
<li class="ss"><a href="aaa">矢量素材</a>
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批改老师：天蓬老师批改时间：2019-01-30 09:32:35
老师总结：多级下拉菜单 , 是经常遇到的需求, 不过, 现在的一个趋势是减少菜单的层级, 基本上都是单级居多, 毕竟如果手机访问, 多级很难操作的,对吧, 但对于多级的实现原理, 还是要掌握的
