小米官网的css3导航菜单

HTML代码：

 <div class="nav">
       <ul>
           <li><a href="#">首页</a></li>
           <li>
               <a href="#">
                   小米手机
                   <div class="xs">
                       <div class="xiao"></div>
                       <img src="img/1.jpg" />
                   </div>
               </a>
           </li>
           <li>
               <a href="#">
                   红米
                   <div class="xs">
                       <div class="xiao"></div>
                       <img src="img/2.jpg" />
                   </div>
               </a>
           </li>
           <li><a href="#">小米平板</a></li>
           <li><a href="#">小米电视</a></li>
           <li>
               <a href="#">
                   盒子
                   <div class="xs">
                       <div class="xiao"></div>
                       <img src="img/3.jpg" />
                   </div>
               </a>
           </li>
           <li>
               <a href="#">
                   路由器
                   <div class="xs">
                       <div class="xiao"></div>
                       <img src="img/4.jpg" />
                   </div>
               </a>
           </li>
           <li><a href="#">合约机</a></li>
           <li><a href="#">服务</a></li>
           <li><a href="#">社区</a></li>
       </ul>
   </div>

css3样式：

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

         .nav {
             position: relative;
             width: 994px;
             height: 52px;
             background: #404144;
             margin: 0 auto;
         }

             .nav li {
                 list-style: none;
                 float: left;
                 line-height: 50px;
             }

                 .nav li a {
                     display: block;
                     text-decoration: none;
                     color: #FFFFFF;
                     padding: 0px 15px;
                     font-family: "微软雅黑";
                 }

                     .nav li a:hover .xs {
                         display: block;
                     }

                     .nav li a:hover {
                         background: #333333;
                     }

                     .nav li a .xs {
                         border: 1px solid #cccccc;
                         border-top: none;
                         display: none;
                         width: 992px;
                         background: #FFFFFF;
                         position: absolute;
                         top: 50px;
                         left: 0px;
                     }

                         .nav li a .xs .xiao {
                             position: absolute;
                             top: -8px;
                             border-left: 8px solid transparent;
                             border-right: 8px solid transparent;
                             border-bottom: 8px solid #FFFFFF;
                             width: 0px;
                             height: 0px;
                             z-index:;
                         }

                 .nav li:nth-child(1) .xiao {
                     left: 20px;
                 }

                 .nav li:nth-child(2) .xiao {
                     left: 98px;
                 }

                 .nav li:nth-child(3) .xiao {
                     left: 177px;
                 }

                 .nav li:nth-child(4) .xiao {
                     left: 255px;
                 }

                 .nav li:nth-child(5) .xiao {
                     left: 348px;
                 }

                 .nav li:nth-child(6) .xiao {
                     left: 427px;
                 }

                 .nav li:nth-child(7) .xiao {
                     left: 496px;
                 }

                 .nav li:nth-child(8) .xiao {
                     left: 576px;
                 }

                 .nav li:nth-child(9) .xiao {
                     left: 646px;
                 }

                 .nav li:nth-child(10) .xiao {
                     left: 706px;
                 }

转载：http://www.w2bc.com/article/jquery-xiaomi-nav