效果图：
base.css
/*重置样式*/
*,::before,::after{
/*选择所有的标签*/
margin:0;
padding:0;
/*清楚移动端默认的 点击高亮效果*/
-webkit-tap-highlight-color:transparent;
/*设置所有的都是以边框开始计算宽度 百分比*/
-webkit-box-sizing:border-box;/*兼容*/
box-sizing:border-box;
}
body{
font-size:14px;
font-family:"Microsoft YaHei",sans-serif;/*设备默认字体*/
color:333;
}
a{
color:333;
text-decoration:none;/*不显示下划线*/
}
a:hover{
text-decoration:none;/*不显示下划线*/
}
ul,ol{
list-style:none;
}
input{
border:none;
outline:none;
/*清除移动端默认的表单样式*/
-webkit-appearance:none;
}
/*公共样式*/
.f_left{
float:left;
}
.f_right{
float:right;
}
.clearfix::before,.clearfix::after{
content:"";
height:0;
line-height:0;
display:block;
visibility:hidden;
clear:both;
}
[class^="icon_"]{
background: url("../images/sprites.png") no-repeat;
background-size:200px 200px;
}
index.css
.layout{
width:100%;
max-width: 640px;
min-width: 300px;
margin:0 auto;
position: relative;
}
.jd_header{
position: fixed;
left: 0;
top:0;
height:40px;
width:100%;
}
.jd_header>.jd_header_box{
position: relative;
width: 100%;
max-width: 640px;
min-width: 300px;
margin:0 auto;
background: red;
height:40px;
}
.jd_header>.jd_header_box>.icon_logo{
width:60px;
height:36px;
position: absolute;
/*background: url("../images/sprites.png") no-repeat;*/
/*background-size:200px 200px;*/
background-position: 0 -103px;
top: 4px;
left: 10px;
}
.jd_header>.jd_header_box>.login{
width: 50px;
height: 40px;
line-height:40px;
text-align: center;
color: #ffffff;
position: absolute;
right:0;
top:0;
font-size: 15px;
}
.jd_header>.jd_header_box>form{
width:100%;
padding-left:75px;
padding-right:50px;
height:40px;
position: relative;
}
.jd_header>.jd_header_box>form>input{
width:100%;
height:30px;
border-radius:15px;
margin-top:5px;
padding-left:10px;
}
.jd_header>.jd_header_box>form>.icon_search{
height:20px;
width:20px;
position: absolute;
background-position: -60px -109px;
top:10px;
left:85px;
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0">
<title></title>
<link rel="stylesheet" href="css/base.css" />
<link rel="stylesheet" href="css/index.css">
</head>
<body>
<div class="layout">
<header class="jd_header">
<div class="jd_header_box">
<a href="#" class="icon_logo"></a>
<form action="#">
<span class="icon_search"></span>
<input type="search" placeholder="提示站位">
</form>
<a href="#" class="login">登录</a>
</div>
</header>
</div>
</body>
</html>
1,href="#"
2,样式中的>
3，fixed的用法
4，提取公共样式
5，position的用法
时间： 2024-10-22 18:11:03