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="width: 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;
}  

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原文地址：https://www.cnblogs.com/chenduzizhong/p/9993215.html