一.注意点:
1.选择器的使用
①element1>element2:如果元素element2不是父元素element1的直接子元素,则不会被选择。
②element1+element2: 选择器用于选取第一个指定的元素element1之后(不是内部)紧跟的元素element2,同级元素
③:hover :选择器用于选择鼠标指针浮动在上面的元素
④:after: 选择器在被选元素的内容后面插入内容。
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style type="text/css">
body,ul,li,a,p{margin: 0;padding: 0;}
a{text-decoration: none; color: #555;font-size: 23px;}
.clearfix:after,.zn-clearfix:before{content: ""; visibility: hidden; display: block; height: 0; clear: both; }
.clearfix{zoom:1;margin: 20px auto; width:1700px;}
.zn-header-nav ul li {
position:relative;
display: inline-block;
}
ul .sub-menu.zn-header-menussub{
position: absolute;
background: #fff;
left: 0;
top: 40px;
width: 175px;
border-radius: 5px;
-moz-box-shadow: 0px 0px 3px #ccc;
-webkit-box-shadow: 0px 0px 3px #ccc;
box-shadow: 0px 0px 3px #ccc;
}
ul .sub-menu.zn-header-menussub:after{
content: "";
position: absolute;
left: -66px;
background: url(../images/navtop.png);
z-index: 3;
top: -14px;
top: 3px\9;
height: 14px;
font-size: 0px;
overflow: hidden;
width: 174px;
}
ul .sub-menu.zn-header-menussub li>a{
text-align: left;
margin: 0;
display: block;
padding: 4px 25px;
}
ul.zn-header-menus>li>a:hover {
background: #4c2f0d;
color: #fff;
}
ul .sub-menu.zn-header-menussub li:hover a{
background: #644b2e;
color: #fff;
}
ul .sub-menu.zn-header-menussub li,ul .zn-header-menusbb.sub-menu li{
width: 100%;
line-height: 30px;
}
ul .zn-header-menusbb.sub-menu{
position: absolute;
top: 0;
left: 175px;
background: #644b2e;
width: 150px;
padding-bottom: 10px;
}
ul .sub-menu {
display:none;
}
.zn-header-nav ul .zn-header-menusbb.sub-menu li a{
color: #fff;
}
.zn-header-nav ul .zn-header-menusbb.sub-menu li:hover a{
background: #ccc;
}
ul.zn-header-menus li:hover .zn-header-menussub{
display: block;
}
ul .sub-menu.zn-header-menussub li:hover a+.zn-header-menusbb{
display: block;
}
</style>
</head>
<body>
<div class="zn-header-nav">
<ul class="zn-header-menus">
<li><a href="./" >首頁</a></li>
<li>
<a href="#" class="active">產品介紹</a>
<ul class="sub-menu zn-header-menussub ">
<li>
<a href="#2">照片書</a>
<ul class="sub-menu zn-header-menusbb">
<li><a href="#1">精裝</a></li>
<li><a href="#1">簡裝</a></li>
<li><a href="#1">騎馬釘</a></li>
</ul>
</li>
<li>
<a href="#2">卡片系列</a>
<ul class="sub-menu zn-header-menusbb">
<li><a href="#1">半島鐵盒</a></li>
<li><a href="#1">分享卡</a></li>
</ul>
</li>
<li>
<a href="#">相片月歷</a>
<ul class="sub-menu zn-header-menusbb">
<li><a href="#1">臺歷</a></li>
<li><a href="#1">掛歷</a></li>
</ul>
</li>
<li>
<a href="#">相片小物</a>
<ul class="sub-menu zn-header-menusbb">
<li><a href="#1">拼圖</a></li>
<li><a href="#1">水杯</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">服務</a></li>
<li><a href="#">製作指南</a></li>
<li><a href="#">客服聯絡</a></li>
<li><a href="#">公司背景</a></li>
</ul>
</div>
</body>
</html>