(1)布局定位属性
display/position/float/clear/visibility/overflow(建议display第一个写,关系到模式)
(2)自身属性
width/height/margin/padding/border/background
(3)文本属性
color/font/text-decoration/text-align/vertical-align/white-space/break-word
(4)其他属性(CSS3)
content/cursor/border-radius/box-shadow/text-shadow/background:linear-gradient
1、先确定页面的版心(可视区)
2、分析页面中的行模块(标准流)和每个行模块中的列模块(浮动,页面布局第一准则)
3、一行中的列模块经常使用浮动布局,先确定每个列的大小,之后确定列的位置(页面布局第二准则)
4、遵循先有结构,后加样式原则
(1)导航栏:实际一般使用li+a的做法
原因:
li+a语义更清晰,适合有条理的列表型内容;
直接用a,搜索引擎容易辨别为有堆砌关键字嫌疑,容易被降权,影响网站排名
(2)搜索框和搜索按钮,添加浮动,属于表单元素(行内块元素),相邻的行内块元素中间会有默认的距离,浮动会消除这个距离
(3)button默认有边框,border,需要去掉
html:
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>Documenttitle>
<link rel="stylesheet" href="./style.css">
head>
<body>
<div class="box header">
<div>
<div class="logo">
<img class="img" src="./img/学成在线.png" alt="">
div>
<div class="nav">
<ul>
<li><a href="#">首页a>li>
<li><a href="#">课程a>li>
<li><a href="#">职业规划a>li>
ul>
div>
<div class="search">
<input type="text" placeholder="输入关键词">
<button>button>
div>
<div class="user">
<img src="./images/user.png" alt="">
lesheng
div>
div>
div>
<div class="banner">
<div class="box">
<div class="subnav">
<ul>
<li><a href="#">前端开发<span>>span>a>li>
<li><a href="#">后端开发<span>>span>a>li>
<li><a href="#">移动开发<span>>span>a>li>
<li><a href="#">人工智能<span>>span>a>li>
<li><a href="#">商业预测<span>>span>a>li>
<li><a href="#">云计算&大数据<span>>span>a>li>
<li><a href="#">运维&从测试<span>>span>a>li>
<li><a href="#">UI设计<span>>span>a>li>
<li><a href="#">产品<span>>span>a>li>
ul>
div>
<div class="course">
<dl>
<dt>我的课程表dt>
<dd>继续学习 程序语言设计<span>正在学习-使用对象span>dd>
<dd>继续学习 程序语言设计<span>正在学习-使用对象span>dd>
<dd>继续学习 程序语言设计<span>正在学习-使用对象span>dd>
dl>
<button>全部课程button>
div>
div>
div>
<div class="recommand box">
<h3>精品推荐h3>
<ul>
<li><a>JQuerya>li>
<li><a>JQuerya>li>
<li><a>JQuerya>li>
<li><a>JQuerya>li>
<li><a>JQuerya>li>
<li><a>JQuerya>li>
ul>
<a class="mod" href="#">修改兴趣a>
div>
<div class="good box">
<div class="good-hd">
<h3>精品推荐h3>
<a href="#">查看全部a>
div>
<div class="good-bd">
<ul>
<li>
<em>
<img src="./images/hot.png" alt="">
em>
<img src="./images/pic.png" alt="">
<p>Think PHP 5.0 博客系统实战项目演练p>
<span class="level">高级span>
<span class="num">·span>
<span class="num">1125人在学习span>
li>
<li>
<img src="./images/pic.png" alt="">
<p>Think PHP 5.0 博客系统实战项目演练p>
<span class="level">高级span>
<span class="num">·span>
<span class="num">1125人在学习span>
li>
<li>
<img src="./images/pic.png" alt="">
<p>Think PHP 5.0 博客系统实战项目演练p>
<span class="level">高级span>
<span class="num">·span>
<span class="num">1125人在学习span>
li>
<li>
<img src="./images/pic.png" alt="">
<p>Think PHP 5.0 博客系统实战项目演练p>
<span class="level">高级span><span class="num">·span>
<span class="num">1125人在学习span>
li>
<li class="last">
<img src="./images/pic.png" alt="">
<p>Think PHP 5.0 博客系统实战项目演练p>
<span class="level">高级span><span class="num">·span>
<span class="num">1125人在学习span>
li>
<li>
<img src="./images/pic.png" alt="">
<p>Think PHP 5.0 博客系统实战项目演练p>
<span class="level">高级span><span class="num">·span>
<span class="num">1125人在学习span>
li>
<li>
<img src="./images/pic.png" alt="">
<p>Think PHP 5.0 博客系统实战项目演练p>
<span class="level">高级span><span class="num">·span>
<span class="num">1125人在学习span>
li>
<li>
<img src="./images/pic.png" alt="">
<p>Think PHP 5.0 博客系统实战项目演练p>
<span class="level">高级span><span class="num">·span>
<span class="num">1125人在学习span>
li>
<li>
<img src="./images/pic.png" alt="">
<p>Think PHP 5.0 博客系统实战项目演练p>
<span class="level">高级span><span class="num">·span>
<span class="num">1125人在学习span>
li>
<li class="last">
<img src="./images/pic.png" alt="">
<p>Think PHP 5.0 博客系统实战项目演练p>
<span class="level">高级span><span class="num">·span>
<span class="num">1125人在学习span>
li>
ul>
div>
div>
<div class="footer">
<div class="box">
<div class="copyright">
<img src="./images/logo.png" alt="">
<p>学成在线致力于普及中国最好的教育它与中国一流大学和机构合作提供在线课程。<br>
© 2017年XTCG Inc.保留所有权利。-沪ICP备15025210号p>
<a href="#">下载APPa>
div>
<div class="links">
<dl>
<dt>关于学成网dt>
<dd>关于dd>
<dd>管理团队dd>
<dd>工作机会dd>
<dd>客户服务dd>
<dd>帮助dd>
dl>
<dl>
<dt>关于学成网dt>
<dd>关于dd>
<dd>管理团队dd>
<dd>工作机会dd>
<dd>客户服务dd>
<dd>帮助dd>
dl>
<dl>
<dt>关于学成网dt>
<dd>关于dd>
<dd>管理团队dd>
<dd>工作机会dd>
<dd>客户服务dd>
<dd>帮助dd>
dl>
div>
div>
div>
body>
html>
css:
* {
margin: 0;
padding: 0;
}
body {
background-color: #faf9f9;
}
li {
list-style: none;
}
.box {
width: 1200px;
margin: 0 auto;
overflow: hidden;
/* background-color: pink; */
}
.header {
overflow: hidden;
height: 42px;
/* 层叠box里的margin */
margin: 30px auto;
}
.logo {
float: left;
width: 198px;
height: 42px;
}
.nav {
float: left;
margin-left: 37px;
}
.nav ul li {
float: left;
padding-left: 37px;
font-size: 18px;
}
.nav ul li a {
display: block;
height: 42px;
color: #050505;
text-decoration: none;
line-height: 42px;
padding: 0 10px;
}
.nav ul li a:hover {
border-bottom: 2px solid #0099ff;
color: #0099ff;
}
.search {
float: left;
margin-left: 70px;
width: 412px;
height: 42px;
}
.search input {
float: left;
width: 345px;
height: 40px;
border: 1px solid #0099ff;
border-right: 0;
color: #bfbfbf;
font-size: 14px;
padding-left: 15px;
}
.search button {
float: left;
width: 50px;
height: 42px;
background-image: url(./images/btn.png);
border: 0;
}
.user {
float: right;
margin-right: 30px;
font-size: 14px;
line-height: 42px;
}
.banner{
height: 420px;
background-color: #330066;
}
.banner .box{
background: url(./images/banner2_20190819_210028.png) no-repeat top center;
height: 420px;
}
.subnav{
float: left;
background-color: rgba(0,0,0,0.5);
width: 190px;
height: 420px;
}
.subnav li{
height: 45px;
line-height: 45px;
padding: 0 20px;
}
.subnav li a{
color: #fff;
font-size: 14px;
text-decoration: none;
}
.subnav li a span{
float: right;
}
.subnav li a:hover{
color: #0099ff;
}
.course{
float: right;
width: 230px;
height: 300px;
background-color: #ffffff;
margin:50px 0;
}
.course dt{
background-color: #649c9c;
height: 50px;
color: #fff;
line-height: 50px;
text-align: center;
}
.course dd{
height: 30px;
font-size: 16px;
margin: 0 20px;
padding: 15px 0px;
border-bottom:1px #ccc solid ;
}
.course dd span{
display: block;
font-size: 12px;
color: #ccc;
}
.course button{
border: 1px #0099ff solid;
background-color: #fff;
color: #0099ff;
width: 190px;
height: 38px;
margin: 10px 20px;
}
.recommand{
height: 60px;
box-shadow: 0 2px 3px rgba(0,0,0,0.2);
margin-top: 10px;
/* 行高会继承,实现垂直居中 */
line-height: 60px;
}
.recommand h3{
float: left;
margin-left: 30px;
color: #0099ff;
font-size: 16px;
}
.recommand ul{
float: left;
margin-left: 30px;
}
.recommand ul li{
float: left;
}
.recommand ul li a{
padding: 0 30px;
border-left: 1px solid #bfbfbf;
font-size: 16px;
}
.recommand .mod{
float: right;
margin-right: 30px;
color: #0099ff;
font-size: 14px;
text-decoration: none;
}
.good{
height: 630px;
margin-top: 40px;
}
.good-hd{
overflow: hidden;
height: 30px;
margin-bottom: 20px;
}
.good-hd h3{
float: left;
font-weight: 400;
font-size: 20px;
color: #333333;
}
.good-hd a{
float: right;
font-size: 12px;
padding-right: 30px;
color: #999999;
text-decoration: none;
}
.good-bd{
float: left;
height: 580px;
}
.good-bd ul li{
float: left;
width: 230px;
height: 270px;
margin-right:12px ;
margin-bottom: 15px;
background-color: #fff;
position: relative;
}
.good-bd ul li em{
position: absolute;
top: 4px;
right: 0;
}
.good-bd ul li > img{
height: 150px;
}
.good-bd ul li p{
font-size: 14px;
padding: 23px 30px;
}
.good-bd ul li span{
float: left;
padding-left: 30px;
font-size: 12px;
padding-bottom: 30px;
}
.good-bd ul li .level{
color: #ff6633;
}
.good-bd ul li .num{
padding-left: 12px;
color: #999999;
}
.good-bd ul .last{
margin-right: 0;
}
.footer{
height: 420px;
width: 100%;
background-color: #fff;
}
.footer .box{
height: 420px;
background-color: #fff;
}
.copyright,
.links{
float: left;
margin-top: 35px;
}
.copyright img{
width: 193px;
height: 40px;
}
.copyright p{
font-size: 12px;
color: #666666;
margin: 40px 0;
}
.copyright a{
font-size: 16px;
color: #0099ff;
border: #0099ff 1px solid;
text-decoration: none;
padding: 13px 28px;
}
.links dl{
float: left;
margin-left: 137px;
}
.links dt{
font-size: 16px;
color: #333333;
margin-bottom: 15px;
}
.links dd{
font-size: 12px;
color: #333333;
}