学完制作出这个导航效果之后，收获最多的是了解了hover选择器的功能，:hover 选择器用于选择鼠标指针浮动在上面的元素。在鼠标移到元素上时向此元素添加特殊的样式（CSS）。例如：改变鼠标悬停处的元素或其子元素的边框，颜色，大小，显示等。
每天积累一点，定会有所进步！
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
body {
padding: 0;
font-size: 10pt;
} .topmenu {
display: block;
width: 220px;
border: 2px solid #e4393c;
margin: 0;
padding: 0;
} .toptitle {
height: 40px;
line-height: 40px;
text-align: left;
font-size: 11pt;
font-weight: bold;
color: white;
background: #E4393C;
padding-left: 20px;
} .topmenu li {
height: 30px;
line-height: 30px;
font-size: 11pt;
/*去除li小圆点*/
list-style-type: none;
text-align: left;
padding-left: 8px;
z-index: 3;
background-image: url(../../img/20161116/1.jpg);
background-repeat: no-repeat;
background-position: right;
}
/*hover效果为鼠标移动到上面触发相应效果*/ .topmenu li:hover {
border: 1px solid #DDD;
border-right: 0;
box-shadow: 0 0 8px #DDD;
-webkit-box-shadow: 0 0 8px #DDD;
background-image: none;
} .topmenu li a {
/*去除下划线*/
text-decoration: none;
color: #313131;
} .topmenu li a:hover {
text-decoration: underline;
font-weight: bold;
color: #e4393c;
} .submenu {
display: none;
width: 715px;
left: 220px;
position: absolute;
top: 40px;
border: 1px solid #DDD;
z-index: 4;
background: white;
box-shadow: 0 0 8px #DDD;
-webkit-box-shadow: 0 0 8px #DDD;
}
/*鼠标移上时显示类submenu模块*/
.topmenu li:hover .submenu {
display: block;
} .topmenu li:hover span {
background: white;
display: inline-block;
z-index: 20;
width: 20px;
height: 30px;
float: right;
position: relative;
} .leftdiv {
background: white;
float: left;
width: 490px;
margin: 5px;
} .rightdiv {
background: white;
float: left;
width: 200px;
margin: 5px;
}
.leftdiv dl{
display: block;
border-bottom: 1px solid #EEE;
padding-bottom: 6px;
overflow: hidden;
}
.leftdiv dl dt{
display: block;
float: left;
width: 60px;
text-align: right;
height: 22px;
line-height: 22px;
padding-right: 6px;
} .leftdiv dl dt a{
color: #e4393c;
font-weight: bold;
text-decoration: underline;
font-size: 10pt;
}
.leftdiv dl dd{
display: block;
overflow: hidden;
}
.leftdiv dl dd a{
/* 在此插入CSS样式 */
color: #737373;
font-size: 9pt;
padding: 0 8px;
height: 14px;
line-height: 14px;
margin: 4px 0;
} .rightdiv dl dd{
margin: 3px 0;
} .rightdiv dl dt{
color: #e4393c;
font-weight: bold;
font-size: 10pt;
} .rightdiv dl dd a{
font-size: 9pt;
color: #737373;
line-height: 22px;
}
.rightdiv dl dd a:hover{
color: #737373;
font-weight: normal;
}
</style>
</head> <body>
<ul class="topmenu">
<div class="toptitle">
全部商品分类
</div>
<li><a href="#">图书、音像、数字商品</a><span></span>
<div class="submenu">
<div class="leftdiv">
<dl>
<dt><a href="#">电子书</a></dt>
<dd>
<a href="#">免费</a> <a href="#">小说</a> <a href="#">励志与成功</a> <a href="#">婚恋/两性</a>
<a href="#">文学</a> <a href="#">经管</a> <a href="#">畅读VIP</a>
</dd>
</dl>
<dl>
<dt><a href="#">数字音乐</a></dt>
<dd>
<a href="#">通俗流行</a> <a href="#">古典音乐</a> <a href="#">摇滚说唱</a> <a href="#">爵士蓝调</a>
<a href="#">乡村民谣</a> <a href="#">有声读物</a>
</dd>
</dl>
<dl>
<dt><a href="#">音像</a></dt>
<dd>
<a href="#">音乐</a> <a href="#">影视</a> <a href="#">教育音像</a> <a href="#">游戏</a>
</dd>
</dl>
<dl>
<dt><a href="#">文艺</a></dt>
<dd>
<a href="#">小说</a> <a href="#">文学</a> <a href="#">青春文学</a> <a href="#">传记</a> <a
href="#">艺术</a>
</dd>
</dl>
<dl>
<dt><a href="#">人文社科</a></dt>
<dd>
<a href="#">历史</a> <a href="#">心理学</a> <a href="#">政治/军事</a> <a href="#">国学/古籍</a>
<a href="#">哲学/宗教</a> <a href="#">社会科学</a>
</dd>
</dl>
<dl>
<dt><a href="#">经管励志</a></dt>
<dd>
<a href="#">经济</a> <a href="#">金融与投资</a> <a href="#">管理</a> <a href="#">励志与成功</a>
</dd>
</dl>
<dl class="fore7">
<dt><a href="#">生活</a></dt>
<dd>
<a href="#">家教与育儿</a> <a href="#">旅游/地图</a> <a href="#">烹饪/美食</a> <a href="#">时尚/美妆</a>
<a href="#">家居</a> <a href="#">婚恋与两性</a> <a href="#">娱乐/休闲</a> <a href="#">健身与保健</a>
<a href="#">动漫/幽默</a> <a href="#">体育/运动</a>
</dd>
</dl>
<dl>
<dt><a href="#">科技</a></dt>
<dd>
<a href="#">科普</a> <a href="#">IT</a> <a href="#">建筑</a> <a href="#">医学</a> <a href="#">
工业技术</a> <a href="#">电子/通信</a> <a href="#">农林</a> <a href="#">科学与自然</a>
</dd>
</dl>
<dl>
<dt><a href="#">少儿</a></dt>
<dd>
<a href="#">少儿</a> <a href="#">0-2岁</a> <a href="#">3-6岁</a> <a href="#">7-10岁</a>
<a href="#">11-14岁</a>
</dd>
</dl>
<dl>
<dt><a href="#">教育</a></dt>
<dd>
<a href="#">教材</a> <a href="#">中小学教辅</a> <a href="#">考试</a> <a href="#">外语学习</a>
</dd>
</dl>
<dl>
<dt><a href="#">其它</a></dt>
<dd>
<a href="#">英文原版书</a> <a href="#">港台图书</a> <a href="#">工具书</a> <a href="#">套装书</a>
<a href="#">杂志/期刊</a>
</dd>
</dl>
</div>
<div class="rightdiv">
<dl>
<dd>
<a href="http://sale.jd.com/act/1XDZ6ShE5M7tTrl.html">
<img src="http://img30.360buyimg.com/erpVCAare/g16/M00/0B/1B/rBEbRlOCFcoIAAAAAAArMNB2tlkAACTlwDgVG8AACtI514.jpg"
width="194" height="70" title="\家电">
</a>
</dd>
<dd>
<a href="http://sale.jd.com/act/v8kJIaPmsMGuebpH.html">
<img src="http://img30.360buyimg.com/erpVCAare/g16/M00/0B/19/rBEbRlOAiHUIAAAAAAAx8X2c6oIAACTCAP56A4AADIJ112.jpg"
width="194" height="70" title="小家电--三请聚宝盆">
</a>
</dd>
</dl>
<dl>
<dt>推荐品牌</dt>
<dd>
<a href="#">美的官方旗舰店</a>
</dd>
<dd>
<a href="#">苏泊尔旗舰店</a>
</dd>
<dd>
<a href="#">九阳旗舰店</a>
</dd>
<dd>
<a href="#">东菱旗舰店</a>
</dd>
<dd>
<a href="#">海尔统帅旗舰店</a>
</dd>
<dd>
<a href="#">小熊旗舰店</a>
</dd>
</dl>
<img src="wii.png" class="rightPic" />
</div>
</div>
</li>
<li>
<a href="#">家用电器</a>
</li>
<li>
<a href="#">手机、数码</a>
</li>
<li>
<a href="#">电脑、办公</a>
</li>
<li>
<a href="#">家居、家具、家装、厨具</a>
</li>
<li>
<a href="#">服饰内衣、珠宝首饰</a>
</li>
<li>
<a href="#">个护化妆</a>
</li>
<li>
<a href="#">鞋靴、箱包、钟表、奢侈品</a>
</li>
<li>
<a href="#">运动户外</a>
</li>
<li>
<a href="#">汽车用品</a>
</li>
</ul>
</body> </html>