前端学习之京东左侧导航栏
1. 学会用 nav 制作导航栏；
2. 居中设置：margin : xpx auto ;
3. 去掉下划线：text-decoration ;
4. 文字垂直居中：line-hight: x px，这里的x设置为与父元素的行高（hight）一样的数值 ；
效果图（因为不会弄动图所以看不了动态效果，详见京东主页面）：
整体代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>京东左侧导航栏</title>
<style>
body{
background-color: #bfa;
}
.left-nav{
background-color: #fff;
height: 450px;
width: 190px;
padding: 10px 0px;
margin: 50px auto;
}
.item:hover{
background-color:#D9D9D9;
}
.item{
padding-left: 18px;
height: 25px;
line-height: 25px;
font-size: 14px;
}
a{
color: black;
font-size: 14px;
}
a:hover{
color: red;
}
a{
text-decoration: none;
}
span{
padding: 2px;
}
</style>
</head>
<body>
<nav class="left-nav">
<div class="item">
<a href="#" class="a">家用电器</a>
</div>
<div class="item">
<a href="#">手机</a><span>/</span><a href="#">运营商</a><span>/</span><a href="#">数码</a>
</div>
<div class="item">
<a href="#">电脑</a><span>/</span><a href="#">办公</a>
</div>
<div class="item">
<a href="#">家居</a><span>/</span><a href="#">家具</a><span>/</span><a href="#">家装</a><span>/</span><a href="#">厨具</a>
</div>
<div class="item"><a href="#">男装</a><span>/</span><a href="#">女装</a><span>/</span><a href="#">童装</a><span>/</span><a href="#">内衣</a>
</div>
<div class="item">
<a href="#">美妆</a><span>/</span><a href="#">个体清洁</a><span>/</span><a href="#">宠物</a>
</div>
<div class="item">
<a href="#">女鞋</a><span>/</span><a href="#">箱包</a><span>/</span><a href="#">钟表</a><span>/</span><a href="#">珠宝</a>
</div>
<div class="item">
<a href="#">男鞋</a><span>/</span><a href="#">运动</a><span>/</span><a href="#">户外</a>
</div>
<div class="item">
<a href="#">房产</a><span>/</span><a href="#">汽车</a><span>/</span><a href="#">汽车用品</a>
</div>
<div class="item">
<a href="#">母婴</a><span>/</span><a href="#">玩具乐器</a>
</div>
<div class="item">
<a href="#">食品</a><span>/</span><a href="#">酒类</a><span>/</span><a href="#">生鲜</a><span>/</span><a href="#">特产</a>
</div>
<div class="item">
<a href="#">艺术</a><span>/</span><a href="#">礼品鲜花</a><span>/</span><a href="#">农资绿植</a>
</div>
<div class="item">
<a href="#">医药保健</a><span>/</span><a href="#">计生情趣</a>
</div>
<div class="item">
<a href="#">图书</a><span>/</span><a href="#">文娱</a><span>/</span><a href="#">教育</a><span>/</span><a href="#">电子书</a>
</div>
<div class="item">
<a href="#">机票</a><span>/</span><a href="#">酒店</a><span>/</span><a href="#">旅游</a><span>/</span><a href="#">生活</a>
</div>
<div class="item">
<a href="#">理财</a><span>/</span><a href="#">众筹</a><span>/</span><a href="#">白条</a><span>/</span><a href="#">保险</a>
</div>
<div class="item">
<a href="#">安装</a><span>/</span><a href="#">维修</a><span>/</span> <a href="#">清洗</a><span>/</span><a href="#">二手</a>
</div>
<div class="item">
<a href="#">工业品</a>
</div>
</nav>
</body>
</html>
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