多级下拉菜单效果

栏目: Html · 发布时间: 6年前

核心属性

line-height: 60px 设置菜单项的高度

:hover + display 悬停隐藏和显示子菜单

position: relative + top: -60px + left: 170px 子菜单位于父菜单的右侧

:after + :only-child:after + content 给有子菜单的菜单项添加“+”符号

相关知识

:only-child表示一个元素是它父元素唯一的元素，:only-of-type表示有很多种元素，其中只有一种元素是唯一的。

```
<div id="container">
```
```
<nav>
```
```
<ul>
```
```
<li><a href="#">主页</a></li>
```
```
<li><a href="#">博客</a>
```
```
<ul>
```
```
<li><a href="#">主题</a></li>
```
```
<li><a href="#">插件</a></li>
```
```
<li><a href="#">文章</a></li>
```
```
</ul>
```
```
</li>
```
```
<li><a href="#">网页设计</a>
```
```
<ul>
```
```
<li><a href="#">资源</a></li>
```
```
<li><a href="#">链接</a></li>
```
```
<li><a href="#">文章</a>
```
```
<ul>
```
```
<li><a href="#">HTML/CSS</a></li>
```
```
<li><a href="#">jQuery</a></li>
```
```
<li><a href="#">其它</a>
```
```
<ul>
```
```
<li><a href="#">插件</a></li>
```
```
<li><a href="#">问题</a></li>
```
```
<li><a href="#">其它</a></li>
```
```
</ul>
```
```
</li>
```
```
</ul>
```
```
</li>
```
```
</ul>
```
```
</li>
```
```
<li><a href="#">平面设计</a></li>
```
```
<li><a href="#">灵感</a></li>
```
```
<li><a href="#">联系</a></li>
```
```
<li><a href="#">关于</a></li>
```
```
</ul>
```
```
</nav>
```
```
</div>
```

```
body {
```
```
color: #ffffff;
```
```
background: #212121;
```
```
font-size: 22px;
```

font-family: 'Microsoft JhengHei', sans-serif;

```
word-wrap: break-word;
```
```
}
```
```
a {
```
```
color: #FFF;
```
```
}
```
```
#container {
```
```
margin: 0 auto;
```
```
}
```
```
nav {
```
```
margin: 50px 0;
```
```
background-color: #E64A19;
```
```
}
```
```
nav ul {
```
```
position: relative;
```
```
padding: 0;
```
```
margin: 0;
```
```
list-style: none;
```
```
}
```
```
nav ul li {
```
```
display: inline-block;
```
```
background-color: #E64A19;
```
```
}
```
```
nav a {
```
```
display: block;
```
```
line-height: 60px;
```
```
padding: 0 10px;
```
```
color: #FFF;
```
```
font-size: 20px;
```
```
text-decoration: none;
```
```
}
```
```
nav a:hover {
```
```
background-color: #000000;
```
```
}
```
```
nav ul ul {
```
```
position: absolute;
```
```
display: none;
```
```
top: 60px;
```
```
}
```
```
nav ul li:hover > ul {
```
```
display: inherit;
```
```
}
```
```
nav ul ul li {
```
```
position: relative;
```
```
display: block;
```
```
width: 170px;
```
```
}
```
```
nav ul ul ul li {
```
```
position: relative;
```
```
top: -60px;
```
```
left: 170px;
```
```
}
```
```
li > a:after { content:  ' +'; }
```

li > a:only-child:after { content: ''; }

以上所述就是小编给大家介绍的《多级下拉菜单效果》，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对码农网的支持！

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