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Teacher's comments：
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一、知识点：页面布局：绝对定位布局，双飞翼布局、圣杯布局。
二、作业代码：
编程:固定定位制作QQ在线客；
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>qq在线</title>
</head>
<body>
<style>
.box1 {
position: fixed;
top: 0;
right: 0;
}
.close {
position: absolute;
right: 2px;
top: 2px;
}
img{
width: 100px;
height: 100px;
}
</style>
<div class="container">
<h1 style="text-align:center;margin:3rem;background:#ccc;" >服务中心</h1>
<div class="main">
<h3 style="text-align:center;">请联系在线</h3>
</div>
</div>
<div class="box1">
<a href="http://www.baidu.com"><img src="http://ssy.jdfschool.com/img/qq.jpg" alt="在线qq"></a>
<span class="close">X</span>
<span class="close" onclick="this.parentNode.style.display='none' ">X</span>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
编程:浮动实现图文混排;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>图文混排</title>
</head>
<style>
*{
margin: 0;
padding: 0;
}
h2{
text-align: center;
margin-top: 2rem;
}
div{
margin-top: 1rem;
}
img{
margin: 1rem;
width: 140px;
float: right;
}
p{
text-indent: 2rem;
font-size:1.2rem;
margin-left: 1rem;
line-height: 2rem;
}
</style>
<body>
<H2>重要新闻</H2>
<div>
<img src="http://ssy.jdfschool.com/img/qq.jpg" alt="">
<p>在治污减排方面，截至7月底，北京市已淘汰退出548家不符合首都功能定位的一般制造业企业，超额完成全年500家的任务目标。依法清理整治146家“散乱污”企业，实现“动态摸排、动态清零”。</p>
<p>为强化移动源污染执法，北京市以重型柴油车为重点，针对非法销售柴油、非法流动加油倒罐等违法行为开展专项行动，并对重型柴油车实施闭环管理机制。截至7月底，人工检查重型柴油车121.7万辆次、处罚18.3万辆次；检查非道路移动5828台、拟处罚801台。各进京口现场拦截超标排放黑名单车辆1208辆。</p>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
编程: 实例绝对定位三列布局
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>绝对定位三列布局</title>
</head>
<style>
*{
margin: 0;
padding: 0;
}
.head , .foot{
width:100%;
height: 60px;
background: #eee;
}
.content{
width: 1000px;
min-height: 100%;
text-align:center;
line-height: 60px;
background: #aaa;
margin: auto;
}
.container{
height: 650px;
width: 1000px;
background: #d7c100;
position: relative;
margin: auto;
}
.left{
width:200px;
min-height: 100%;
position: absolute;
left: 0;
top:0;
background: #c00;
}
.right{
width: 200px;
min-height: 100%;
position: absolute;
right:0;
top:0;
background: #0c0;
}
.main{
margin: 0 205px;
background: #efefef;
min-height: 100%;
}
</style>
<body>
<div class="head">
<div class="content">网站头部</div>
</div>
<div class="container">
<div class="left"></div>
<div class="main"></div>
<div class="right"></div>
</div>
<div class="foot">
<div class="content">网站尾部</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
编程: 实例演示双飞翼布局；
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>双飞翼布局</title>
</head>
<style>
*{
margin: 0;
padding: 0;
}
.head, .foot{
width:100%;
background: #eee;
height: 60px;
}
.foot{
clear:both;
}
.content{
text-align: center;
width:1000px;
min-height: 100%;
line-height: 60px;
background: #ccc;
margin: auto;
}
.container{
width:1000px;
background: yellow;
margin:auto;
overflow:hidden;
}
.maincontent{
background: #077;
width:100%;
float: left;
}
.main{
min-height: 650px;
margin: 0 205px;
background: #770;
}
.left{
width: 200px;
min-height: 650px;
float:left;
margin-left: -100%;
background: #c00;
}
.right{
width:200px;
min-height: 650px;
float: left;
margin-left: -200px;
background: #00c;
}
</style>
<body>
<div class="head">
<div class="content">头部</div>
</div>
<div class="container">
<div class="maincontent">
<div class="main"></div>
</div>
<div class="left"></div>
<div class="right"></div>
</div>
<div class="foot">
<div class="content">尾部</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
5、圣杯布局
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>圣杯布局</title>
</head>
<style>
.head,.foot{
width: 100%;
background: #eee;
height: 60px;
}
.foot{
clear:both;
}
.content{
width:1000px;
height: 100%;
line-height: 60px;
text-align: center;
background: #ddd;
margin: auto;
}
.container{
width: 600px;
min-height: 650px;
background: #099;
overflow: hidden;
margin: auto;
padding: 0 200px;
}
.main{
width: 100%;
min-height: 650px;
float:left;
background: #fcd;
}
.left{
width: 200px;
min-height: 650px;
float:left;
background: #cdf;
margin-left: -100%;
position: relative;
left:-200px;
}
.right{
width: 200px;
min-height: 650px;
float: left;
background: #cfd;
margin-left: -200px;
position: relative;
right: -200px;
}
</style>
<body>
<div class="head">
<div class="content">网站头部 </div>
</div>
<div class="container">
<div class="main">主体</div>
<div class="left">左侧</div>
<div class="right">右侧</div>
</div>
<div class="foot">
<div class="content">网站尾部</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
6、手写: 双飞冀与圣杯布局的最大区别在哪里？
