二级目录-----纯css(案例:淘宝导航栏)

html:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>易淘</title>
		<script type="text/javascript" src="js/jquery-1.11.0.js"></script>
		<link rel="stylesheet" type="text/css" href="css/header.css" />
		<link rel="stylesheet" type="text/css" href="css/font-awesome-4.7.0/css/font-awesome.css" />
		<link rel="stylesheet" type="text/css" href="css/font-awesome-4.7.0/css/font-awesome.min.css" />
	<body>
		<nav id="header" class="header">
			<span><a class="tag" href="#">中国大陆</a>
				<ul>
					<li><a href="#">全球</a></li>
					<li><a href="#">中国大陆</a></li>
					<li><a href="#">香港</a></li>
					<li><a href="#">台湾</a></li>
					<li><a href="#">澳门</a></li>
					<li><a href="#">韩国</a></li>
					<li><a href="#">马来西亚</a></li>
					<li><a href="#">澳大利亚</a></li>
					<li><a href="#">新加坡</a></li>
					<li><a href="#">新西兰</a></li>
					<li><a href="#">加拿大</a></li>
					<li><a href="#">美国</a></li>
					<li><a href="#">日本</a></li>
				</ul>
			</span>
			<span><a href="#">亲,请登录</a></span>
			<span><a href="#">免费注册</a></span>
			<span><a href="#">手机淘宝</a></span>
			<span><a class="tag" href="#">我的淘宝</a>
				<ul>
					<li><a href="#">已卖到的宝贝</a></li>
					<li><a href="#">我的足迹</a></li>
				</ul>
			</span>
			<span><img src="img/shopcar.png"><a class="Tag" href="#">购物车</a></span>
			<span><img src="img/upterik.png"><img class="img" src="img/twrik.png"><a class="Tag" href="#">收藏夹</a>
				<ul>
					<li><a href="#">收藏的宝贝</a></li>
					<li><a href="#">收藏的店家</a></li>
				</ul>
			</span>
			<span><a href="#">商品分类</a></span>
			<span><a class="tag" href="#">卖家中心</a>
				<ul>
					<li><a href="#">免费开店</a></li>
					<li><a href="#">已卖出的宝贝</a></li>
					<li><a href="#">出售中的宝贝</a></li>
					<li><a href="#">卖家服务市场</a></li>
					<li><a href="#">卖家培训中心</a></li>
					<li><a href="#">体验中心</a></li>
					<li><a href="#">问商友</a></li>
				</ul>
			</span>
			<span><a class="tag" href="#">联系客服</a>
				<ul>
					<li><a href="#">消费者客服</a></li>
					<li><a href="#">卖家客服</a></li>
				</ul>
			</span>
			<span><img src="img/nav.png"><a class="tag" href="#">网站导航</a>
				<ul>
					<!-- i标签的选用是为了避免与li标签事件的混乱 -->
					<i>
						<ul class="example">
							<h2 style="color: orange;">主题市场</h2>
							<li><a href="#">女装</a></li>
							<li><a href="#">男装</a></li>
							<li><a href="#">内衣</a></li>
							<li><a href="#">鞋靴</a></li>
							<li><a href="#">箱包</a></li>
							<li><a href="#">婴童</a></li>
							<li><a href="#">家电</a></li>
							<li><a href="#">数码</a></li>
							<li><a href="#">手机</a></li>
							<li><a href="#">美妆</a></li>
							<li><a href="#">珠宝</a></li>
							<li><a href="#">眼镜</a></li>
							<li><a href="#">手表</a></li>
							<li><a href="#">运动</a></li>
							<li><a href="#">户外</a></li>
							<li><a href="#">乐器</a></li>
							<li><a href="#">游戏</a></li>
							<li><a href="#">动漫</a></li>
							<li><a href="#">影视</a></li>
							<li><a href="#">美食</a></li>
							<li><a href="#">鲜花</a></li>
							<li><a href="#">宠物</a></li>
							<li><a href="#">农资</a></li>
							<li><a href="#">房产</a></li>
							<li><a href="#">装修</a></li>
							<li><a href="#">建材</a></li>
							<li><a href="#">家居</a></li>
							<li><a href="#">百货</a></li>
							<li><a href="#">汽车</a></li>
							<li><a href="#">二手车</a></li>
							<li><a href="#">办公</a></li>
							<li><a href="#">定制</a></li>
							<li><a href="#">教育</a></li>
							<li><a href="#">卡劵</a></li>
							<li><a href="#">本地</a></li>
						</ul>
					</i>
					<i>
						<ul class="example">
							<h2 style="color: limegreen;">特色市场</h2>
							<li><a href="#">爱逛街</a></li>
							<li><a href="#">美妆秀</a></li>
							<li><a href="#">全球购</a></li>
							<li><a href="#">腔调</a></li>
							<li><a href="#">淘女郎</a></li>
							<li><a href="#">星店</a></li>
							<li><a href="#">极有家</a></li>
							<li><a href="#">阿里拍卖</a></li>
							<li><a href="#">淘宝众筹</a></li>
							<li><a href="#">飞猪</a></li>
							<li><a href="#">亲宝贝</a></li>
							<li><a href="#">咸鱼</a></li>
							<li><a href="#">农资</a></li>
							<li><a href="#">天天特卖</a></li>
							<li><a href="#">Outlets</a></li>
							<li><a href="#">丽人购</a></li>
							<li><a href="#">聚名品</a></li>
							<li><a href="#">淘抢购</a></li>
							<li><a href="#">全球精选</a></li>
							<li><a href="#">非常大牌</a></li>
							<li><a href="#">试用</a></li>
							<li><a href="#">量贩团</a></li>
							<li><a href="#">阿里翻译</a></li>
						</ul>
					</i>
					<i>
						<ul class="example">
							<h2 style="color: blueviolet;">阿里APP</h2>
							<li><a href="#">卖家客服</a></li>
							<li><a href="#">香港</a></li>
							<li><a href="#">台湾</a></li>
							<li><a href="#">澳门</a></li>
							<li><a href="#">韩国</a></li>
							<li><a href="#">马来西亚</a></li>
							<li><a href="#">澳大利亚</a></li>
							<li><a href="#">新加坡</a></li>
							<li><a href="#">新西兰</a></li>
							<li><a href="#">加拿大</a></li>
						</ul>
					</i>
					<i>
						<ul class="example">
							<h2 style="color: dodgerblue;">精彩推荐集</h2>
							<li><a href="#">卖家客服</a></li>
							<li><a href="#">香港</a></li>
							<li><a href="#">台湾</a></li>
							<li><a href="#">澳门</a></li>
							<li><a href="#">韩国</a></li>
							<li><a href="#">马来西亚</a></li>
							<li><a href="#">澳大利亚</a></li>
							<li><a href="#">新加坡</a></li>
							<li><a href="#">新西兰</a></li>
							<li><a href="#">加拿大</a></li>
						</ul>
					</i>
				</ul>
			</span>
			<div style="clear: both;"></div>
		</nav>
		<!-- <script>
			$(function(){
				$(".header span:nth-child(6)").mouseover(function(){
					$("#header").css('border','none');
				});
				
				$(".header span:nth-child(6)").mouseout(function(){
					$("#header").css('border-bottom','1px solid lavender');
				});
				
			});
		</script> -->
	</body>
</html>

css:

html,
body {
	height: 100%;
	width: 100%;
}

* {
	margin: 0px;
	border: 0px;
}

.header {
	background: lavender;
	border-bottom: 1px solid lavender;
}

a {
	text-decoration: none;
	color: black;
	font-family: "仿宋";
}

/* 必须要设置为absolute,因为css层叠问题,,,
网址https://www.zhangxinxu.com/wordpress/2016/01/understand-css-stacking-context-order-z-index/ */
ul {
	padding: 5px 0;
	margin: 5px 0 0 -6px;
	display: none;
	opacity: 0;
	/* 透明度 */
	background-color: white;
	list-style: none;
	border: 1px solid lavender;
	border-top: none;
	z-index: 1000;
}

ul li {
	margin-top: 10px;
}

ul li:hover {
	background-color: lavender;
}

.header span {
	float: left;
	padding: 5px 15px 5px 5px;
	margin-left: 10px;
}

.header span:nth-child(1)>ul {
	width: 300px;
	height: 250px;
	overflow-y: scroll;
}

/* 图标 */
.Tag::after,
.tag::after {
	position: absolute;
	display: block;
	height: 3px;
	width: 3px;
	margin: -15px 0 0 70px;
	content: "";
	transform: rotateZ(45deg);
	border: 2px solid darkgray;
	border-top: none;
	border-left: none;
}

.Tag::after {
	margin: -15px 0 0 70px;
}

.img {
	position: absolute;
	margin-left: -17px;
}

.header span>a:hover {
	color: orange;
}

.header span:nth-child(1) ul {
	position: absolute;
}

.header span:nth-child(1):hover {
	background-color: white;
}

.header span:nth-child(1):hover ul {
	display: block;
	opacity: 1;
	left: 0px;
	margin: 5px 0 0 9px;
}

.header span:nth-child(2) ul {
	position: absolute;
}

.header span:nth-child(2) a {
	color: orange;
}

.header span:nth-child(2):hover a {}

.header span:nth-child(3) ul {
	position: absolute;
}

.header span:nth-child(3) a:nth-child(1) {}

.header span:nth-child(4) ul {
	position: absolute;
}

.header span:nth-child(4) {
	margin-right: 20%;
}

.header span:nth-child(4) a:nth-child(1) {}

.header span:nth-child(5) ul {
	position: absolute;
}

.header span:nth-child(5) a:nth-child(5) {}

.header span:nth-child(5):hover {
	background-color: white;
}

.header span:nth-child(5):hover ul {
	display: block;
	opacity: 1;
}

.header span:nth-child(6) ul {
	position: absolute;
}

.header span:nth-child(6):hover {}

.header span:nth-child(7) ul {
	position: absolute;
}

.header span:nth-child(7):hover {
	background-color: white;
}

.header span:nth-child(7):hover .img {
	display: none;
}

.header span:nth-child(7):hover ul {
	display: block;
	opacity: 1;
}

.header span:nth-child(8) ul {
	position: absolute;
}

.header span:nth-child(9) ul {
	position: absolute;
}

.header span:nth-child(9):hover {
	background-color: white;
}

.header span:nth-child(9):hover ul {
	display: block;
	opacity: 1;
}

.header span:nth-child(10) ul {
	position: absolute;
}

.header span:nth-child(10):hover {
	background-color: white;
}

.header span:nth-child(10):hover ul {
	display: block;
	opacity: 1;
}

.header span:nth-child(11):hover {
	background-color: white;
}

.header span:nth-child(11)>ul {
	position: absolute;
	left: 2%;
	width: 96%;
	z-index: 1000;
}

.header span:nth-child(11):hover ul {
	display: block;
	opacity: 1;
}

.header span:nth-child(11)>ul>i {
	width: 24%;
	display: inline-block;
}

.header span:nth-child(11):hover>ul li {
	background-color: white;
}

.header span:nth-child(11) i:nth-child(1) a:hover {
	color: orange;
}

.header span:nth-child(11) i:nth-child(2) a:hover {
	color: limegreen;
}

.header span:nth-child(11) i:nth-child(3) a:hover {
	color: blueviolet;
}

.header span:nth-child(11) i:nth-child(4) a:hover {
	color: dodgerblue;
}

/* 消除边距问题 */
.example {
	margin: 0px;
	padding: 0px 15px;
}

.example h2 {
	font-weight: 600;
	font-size: large;
}

.example li {
	display: inline-block;
}

.example:nth-child(1) li {
	padding: 0 10% 0 0;
}

感触:在css中尽量别给“标签选择器”乱加属性以及定位,一旦html中这种标签复用度变高时,总会产生几个不适合你想法的表现,所以“标签选择器”中的“属性”一定要有普遍性。另外关于absolute,和relative的相爱相杀;hover的注意事项;html中堆叠层级关系以及图标库的应用,,,另作记录。。。。
菜鸟爬行中,,,,,,,,,,,,

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转载自blog.csdn.net/h1234561234561/article/details/85699581