【项⽬2-3】⼿机邮箱导航页⾯效果：
前导知识
a:link  初始状态
a:hover  悬停状态
a:active 单击时的状态
a:visited  访问后的状态
love hate 顺序。
项⽬实战
分析：
步骤
①HTML 布局
②设置基线同⽗元素对齐，调整元素位置
③使⽤font-awesome图标
④设置 a 标签
⑤右侧带样式的⽂字⽤ CSS+ <span> 标签控制HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link href="../0203/css/font-awesome.min.css" rel="stylesheet"> <link rel='stylesheet' href='css/email.css'>
</head>
<body>
<div class="l-main">
<div class="menu">
<header class="menu_header">
<h1 class="menu_header-title">我的邮箱</h1>
</header>
<nav class="menu_body">
<ul class="nav">
<li class="nav_item"><a href=“#" class="nav_item-link is-active">
<i class="fa fa-envelope nav_item-icon"></i>
<span class="nav_item-text">收件箱</span>
<span class="badge badge-warning">32</span></a></li>
<li class="nav_item"><a href="#" class="nav_item-link"><i class="fa fa-flag nav_item-icon">
</i><span class="nav_item-text">红旗邮件</span><span class="badge">7</span></a>
</li>
<li class="nav_item"><a href="#" class="nav_item-link"><i class="fa fa-space-shuttle nav_item-icon"> </i><span class="nav_item-text">已发送</span><span class="badge">0/17</span></a>
</li>
<li class="nav_item"><a href="#" class="nav_item-link"><i class="fa fa-archive nav_item-icon">
</i><span class="nav_item-text">草稿箱</span><span class="badge">2</span></a>
</li>
<li class="nav_item"><a href="#" class="nav_item-link"><i class="fa fa-trash nav_item-icon">
</i><span class="nav_item-text">已删除</span><span class="badge">5</span></a>
</li>
<li class="nav_item"><a href="#" class="nav_item-link"><span class="nav_item-text">
所有邮件</span></a></li>
</ul>
</nav>
</div>
</div>
</body>
</html>
CSS
html,body,div,span,h1,a,ul,li,nav{
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;  /*字体设置，所有元素保持⼀致*/
vertical-align: baseline; /*元素的基线与⽗元素的基线对齐*/
}
body{
line-height: 1em;
background-color: #f4f4f4;
font-family: Arial,sans-serif;
font-size: 14px;
font-weight: lighter;    /*lighter 轻轻地*/
}
.l-main{
width: 530px;
margin: 0 auto;
}
.menu{
width: 250px;
margin: 40px;
background: #fff;
box-shadow: 0 1px 4px rgba(0,0,0,.3);
border-radius: 5px;
float: left;
导航页源码}
.menu_header{
background-color: #4b4f55;
border-bottom: 1px solid #353a40;
border-radius: 5px 5px 0 0 ;
}
.menu_header-title{
color: #fff;
padding: 15px;
text-shadow: 0 1px 0 rgba(0,0,0,0.4);
}
.menu_body{
border-radius: 0 0 5px 5px;
}
.nav{
list-style: none;
}
.nav_item{
position: relative;
}
.nav_item-link{
padding: 10px 15px;
text-decoration: none;
color: #8b8e93;
display: block;
border-bottom: 1px solid #f0f0f0;
}
.nav_item-link:hover{
background: #f0f0f0;
}
.nav_item-link.is-active{
background: #6e757f;
color: #fff;
border-bottom-color: #4b4f55;
box-shadow: 0 1px 0 #7a828d inset;  /*inset 内嵌效果*/ }
.
nav_item-link.is-active:after{
content: "";
display: block;
position: absolute;
top: 50%;
right: -6px;
margin-top: -6px;
border-top: 6px solid transparent;
border-bottom: 6px solid transparent;
border-left: 6px solid #6e757f;
}
.
nav_item-link.is-active{
color: #fff;
}
.nav_item:last-child .nav_item-link{
border-bottom: none;
}
.nav_item-icon{
width: 20px;
text-align: center;
font-size: 18px;
margin-right: 10px;
}
.badge{
font-size: 12px;
padding: 2px 8px;
border: 1px solid #d1d1d1;
border-radius: 10px;
position: absolute;
top: 10px;
right: 15px;
}
.badge-warning{
background: #ed373f;
border-color: #ed373f;
}
.fa-flag{
color: red;
}
.fa-archive{
color: orange;
}
.fa-envelope{
color: #35b3ff;
}
总结
利⽤ :after 来画三⾓
ul 下的第⼀个 li 标签下的 a 元素添加 class=“nav_item-link is-active”
先设置⽗元素 li 相对定位，再设置 a 元素绝对定位

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