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>
原文：http://www.cnblogs.com/chao-zjj/p/6091370.html
