css 菜单_html/css_WEB-ITnose
### css菜单css主要分为一级菜单、二级菜单和多级菜单，而且基本都是用列表来写1、一级菜单：一级菜单可以分为水平方向的，又可以分为纵向的如 1.1水平横向菜单：这种菜单的写法一般有两种，一种是将列表的li标签的display属性设置为display:inline-block;而另外一种则是 直接使用浮动float属性，设置为 float: left;或者 float: right;  代码：```<!DOCTYPE html><html><head lang="en"> <meta charset="UTF-8"> <title>一级横向菜单方法一</title> <!-- 做法是将li的浮动属性设置成向左或者向右方向--> <style type="text/css" rel="stylesheet"> nav ul{ list-style-type: none; } nav ul li{ float: left; margin-right: 5px; } nav ul li a{ text-decoration: none; background-color: aquamarine; } nav ul li a:hover{ background-color: lime; } </style></head><body><nav> <ul> <li><a href="#" >招聘兼职</a></li> <li ><a href="#">房子租赁</a></li> <li ><a href="#">日常用品</a></li> <li><a href="#" >招聘兼职</a></li> <li ><a href="#">房子租赁</a></li> <li ><a href="#">日常用品</a></li> </ul></nav></body></html>``` 1.2一级纵向菜单：这个最简单，直接使用列表即可 (https://static.oschina.net/uploads/img/201510/26205935_iLsd.png )2、二级菜单和多级菜单也可以分为水平方向的，又可以分为纵向的，二级菜单的写法主要是先将二级菜单设置成display:none；然后当鼠标移动经过时将二级菜单设置为可见的就可以了。 代码：```<!DOCTYPE html><html><head lang="en"> <meta charset="UTF-8"> <title>一级横向，二级纵向菜单</title> <!--此种方法为则是将先li的float属性设置成 left即可 然后设置它的二级菜单的display属性为none不可见，但是当鼠标移动到一级菜单时 则将二级菜单的display设置成可见显示 并且将li的float设置为inherit --> <style type="text/css" rel="stylesheet"> *{ margin: 0; padding: 0; } nav{ width: 300px; margin:0 auto; } ul{ list-style-type: none; } li{ float:left; margin-right: 5px; } ul li ul{ display: none; } a{ text-decoration: none; background-color: antiquewhite; } a:hover{ background-color: #ff9900; display: block; } ul li:hover ul{ display: block; position: absolute; } ul li:hover ul li{ float: inherit; } </style></head><body><nav> <ul> <li><a href="#" >招聘兼职</a> <ul class="twonav"> <li><a href="#" >招聘兼职</a></li> <li ><a href="#" >房子租赁</a></li> <li ><a href="#" >日常用品</a></li> </ul> </li> <li ><a href="#" >房子租赁</a> <ul class="twonav"> <li><a href="#" >招聘兼职</a></li> <li ><a href="#" >房子租赁</a></li> <li ><a href="#" >日常用品</a></li> </ul> </li> <li ><a href="#" >日常用品</a> <ul class="twonav"> <li><a href="#" >招聘兼职</a></li> <li ><a href="#" >房子租赁</a></li> <li ><a href="#" >日常用品</a></li> </ul> </li> <li><a href="#" >招聘兼职</a> <ul class="twonav"> <li><a href="#" >招聘兼职</a></li> <li ><a href="#" >房子租赁</a></li> <li ><a href="#" >日常用品</a></li> </ul> </li> </ul></nav></body></html>```
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