abstract：<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>導航</title> <script src="https://code.jquery.com/jquery-3.3.1.min.js&
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>導航</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>
</head>
<body>
<div class="nav">
<ul>
<li><a href="/">首頁</a></li>
<li class="ss"><a href="aaa">矢量素材</a>
<ul class="nav_b">
<li><a href="/vector/classics/">矢量花紋</a></li>
<li><a href="/vector/classics/">經(jīng)典實用</a></li>
<li><a href="/vector/festival/">矢量節(jié)日</a></li>
<li><a href="/vector/design/">廣告設計</a></li>
<li><a href="/vector/chinese_style/">矢量中國</a></li>
<li><a href="/vector/icon/">矢量圖標</a></li>
<li><a href="/vector/trend/">矢量潮流</a></li>
<li><a href="/vector/logo/">矢量標志</a></li>
<li><a href="/vector/life/">生活百科</a></li>
<li><a href="/vector/cartoon/">矢量卡通</a></li>
<li><a href="/vector/people/">矢量人物</a></li>
<li><a href="/vector/transport/">交通運輸</a></li>
<li><a href="/vector/animal/">矢量動物</a></li>
<li><a href="/vector/plant/">矢量植物</a></li>
<li><a href="/vector/landscape/">風景建筑</a></li>
<li><a href="/vector/food_fruit/">食品果蔬</a></li>
<li><a href="/vector/font/">矢量字體</a></li>
<li><a href="/vector/background/">矢量背景</a></li>
<li><a href="/vector/sport/">體育運動</a></li>
<li><a href="/vector/other/">其他矢量</a></li>
</ul>
</li>
<li><a href="#">PNG圖標</a></li>
<li><a href="#">JS代碼</a></li>
<li><a href="#">PSD素材</a></li>
<li><a href="#">圖片素材</a></li>
<li><a href="#">網(wǎng)頁素材</a></li>
<li><a href="#">用戶體驗</a></li>
<li><a href="#">設計分享</a></li>
</ul>
</div>
</body>
</html>
Correcting teacher：天蓬老師Correction time：2019-01-30 09:32:35
Teacher's summary：多級下拉菜單 , 是經(jīng)常遇到的需求, 不過, 現(xiàn)在的一個趨勢是減少菜單的層級, 基本上都是單級居多, 畢竟如果手機訪問, 多級很難操作的,對吧, 但對于多級的實現(xiàn)原理, 還是要掌握的