一款纯css3实现的竖形二级导航的实例教程

　之前为大家分享了好多导航菜单。今天给大家带来一款纯css3实现的竖形二级导航。这款导航菜单可以是无限级。一起看下效果图：

　　实现的代码。

　　html代码：

XML/HTML Code复制内容到剪贴板

<div style=" 700px; margin: auto;">  
        <div class="W1-h16">  
            <ul>  
                <li class="has-sub"><a href="#">Menu 1</a>  
                    <ul>  
                        <li class="has-sub"><a href="#">Submenu 1.1</a>  
                            <ul>  
                                <li><a href="#">Submenu 1.1.1</a></li>  
                                <li class="has-sub"><a href="#">Submenu 1.1.2</a>  
                                    <ul>  
                                        <li><a href="#">Submenu 1.1.2.1</a></li>  
                                        <li><a href="#">Submenu 1.1.2.2</a></li>  
                                    </ul>  
                                </li>  
                            </ul>  
                        </li>  
                        <li><a href="#">Submenu 1.2</a></li>  
                    </ul>  
                </li>  
                <li class="has-sub"><a href="#">Menu 2</a>  
                    <ul>  
                        <li><a href="#">Submenu 2.1</a></li>  
                        <li><a href="#">Submenu 2.2</a></li>  
                    </ul>  
                </li>  
                <li class="has-sub"><a href="#">Menu 3</a>  
                    <ul>  
                        <li><a href="#">Submenu 3.1</a></li>  
                        <li><a href="#">Submenu 3.2</a></li>  
                    </ul>  
                </li>  
            </ul>  
        </div>  
    </div>

　　css3代码：

CSS Code复制内容到剪贴板

.W1-h16 {   
  padding: 0;   
  margin: 0;   
  border: 0;   
  line-height: 1;   
}   
.W1-h16 ul,   
.W1-h16 ul li,   
.W1-h16 ul ul {   
  list-style: none;   
  margin: 0;   
  padding: 0;   
}   
.W1-h16 ul {   
  position: relative;   
  z-index: 500;   
  float: left;   
}   
.W1-h16 ul li {   
  float: left;   
  min-height: 0.05em;   
  line-height: 1em;   
  vertical-align: middle;   
  position: relative;   
}   
.W1-h16 ul li.hover,   
.W1-h16 ul li:hover {   
  position: relative;   
  z-index: 510;   
  cursor: default;   
}   
.W1-h16 ul ul {   
  visibility: hidden;   
  position: absolute;   
  top: 100%;   
  left: 0px;   
  z-index: 520;   
  width: 100%;   
}   
.W1-h16 ul ul li {   
  float: none;   
}   
.W1-h16 ul ul ul {   
  top: 0;   
  rightright: 0;   
}   
.W1-h16 ul li:hover > ul {   
  visibility: visible;   
}   
.W1-h16 ul ul {   
  top: 0;   
  left: 99%;   
}   
.W1-h16 ul li {   
  float: none;   
}   
.W1-h16 ul ul {   
  margin-top: 0.05em;   
}   
.W1-h16 {   
  width: 13em;   
  background: #333333;   
  font-family: 'Oxygen Mono', Tahoma, Arial, sans-serif;   
  zoom: 1;   
}   
.W1-h16:before {   
  content: '';   
  display: block;   
}   
.W1-h16:after {   
  content: '';   
  display: table;   
  clear: both;   
}   
.W1-h16 a {   
  display: block;   
  padding: 1em 1.3em;   
  color: #ffffff;   
  text-decoration: none;   
  text-transform: uppercase;   
}   
.W1-h16 > ul {   
  width: 13em;   
}   
.W1-h16 ul ul {   
  width: 13em;   
}   
.W1-h16 > ul > li > a {   
  border-right: 0.3em solid #1b9bff;   
  color: #ffffff;   
}   
.W1-h16 > ul > li > a:hover {   
  color: #ffffff;   
}   
.W1-h16 > ul > li a:hover,   
.W1-h16 > ul > li:hover a {   
  background: #1b9bff;   
}   
.W1-h16 li {   
  position: relative;   
}   
.W1-h16 ul li.has-sub > a:after {   
  content: '»';   
  position: absolute;   
  rightright: 1em;   
}   
.W1-h16 ul ul li.first {   
  -webkit-border-radius: 0 3px 0 0;   
  -moz-border-radius: 0 3px 0 0;   
  border-radius: 0 3px 0 0;   
}   
.W1-h16 ul ul li.last {   
  -webkit-border-radius: 0 0 3px 0;   
  -moz-border-radius: 0 0 3px 0;   
  border-radius: 0 0 3px 0;   
  border-bottom: 0;   
}   
.W1-h16 ul ul {   
  -webkit-border-radius: 0 3px 3px 0;   
  -moz-border-radius: 0 3px 3px 0;   
  border-radius: 0 3px 3px 0;   
}   
.W1-h16 ul ul {   
  border: 1px solid #0082e7;   
}   
.W1-h16 ul ul a {   
  color: #ffffff;   
}   
.W1-h16 ul ul a:hover {   
  color: #ffffff;   
}   
.W1-h16 ul ul li {   
  border-bottom: 1px solid #0082e7;   
}   
.W1-h16 ul ul li:hover > a {   
  background: #4eb1ff;   
  color: #ffffff;   
}   
.W1-h16.align-rightright > ul > li > a {   
  border-left: 0.3em solid #1b9bff;   
  border-right: none;   
}   
.W1-h16.align-rightright {   
  float: rightright;   
}   
.W1-h16.align-rightright li {   
  text-align: rightright;   
}   
.W1-h16.align-rightright ul li.has-sub > a:before {   
  content: '+';   
  position: absolute;   
  top: 50%;   
  left: 15px;   
  margin-top: -6px;   
}   
.W1-h16.align-rightright ul li.has-sub > a:after {   
  content: none;   
}   
.W1-h16.align-rightright ul ul {   
  visibility: hidden;   
  position: absolute;   
  top: 0;   
  left: -100%;   
  z-index: 598;   
  width: 100%;   
}   
.W1-h16.align-rightright ul ul li.first {   
  -webkit-border-radius: 3px 0 0 0;   
  -moz-border-radius: 3px 0 0 0;   
  border-radius: 3px 0 0 0;   
}   
.W1-h16.align-rightright ul ul li.last {   
  -webkit-border-radius: 0 0 0 3px;   
  -moz-border-radius: 0 0 0 3px;   
  border-radius: 0 0 0 3px;   
}   
.W1-h16.align-rightright ul ul {   
  -webkit-border-radius: 3px 0 0 3px;   
  -moz-border-radius: 3px 0 0 3px;   
  border-radius: 3px 0 0 3px;   
}