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                            <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>在线</title>
</head>
<body>
<style type="text/css" media="screen">
.box4{
    position:fixed;
    right: 20px;
    bottom:20px;
}
.box4 span{
    position:absolute;
    top:5px;
    color:#fff;
    right:5px;
    font-size:30px;
}
</style>
<div class="box4">
    <img src="ads.jpg" style="width:300px;height: 200px;background: #f30;">
    <span> ×</span>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>实战图文混排</title>
</head>
<body>
<style type="text/css" media="screen">
.box{
    width: 600px;
    background:#eee;
    margin:0 auto;
    padding:20px;
}
.box h1{
    text-align:center;
}
.box img{
    float:left;
    margin-right:10px;
    width:310px;
    height:200px;
    background:#f30;
}
.box p{
    font-size:16px;
    color:#666;
    line-height:30px;
    text-indent:2rem;
</style>
<div class="box">
    <h1>PHP中文网三期</h1>
    <img src="ads.jpg" alt="">
    <p>为了第三期的培,我们18位老师和同事历经3月精心准备。每一个PPT,每一行代码,
    每一个实战案例都是经过 我们老师和同事们反复讨论,反复打磨敲定!
    我们追求完美,力求每一节课程都是精品! 为了这次课程,我们的培训老师也是在一起相互试听,
    不断改进教学风格,坚持幽默,深入浅出, 力求每一个学员都能听得懂,
    学得会!我们的辅导老师也是早早准备好!跟进监督每位学员的作业 (避免光学不练空架子),
    及时解答学员的问题,更有回答某些学员的生活上的私人问题~~默默的奉献! 
    PHP中文网第三期线上基础学习内容: HTML5,CSS3,JavaScript,jQuery,Vue.js入门,
     Bootstrap,页面布局实战    《网站管理后台》的模板开发(综合应用以上所学知识)</p>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>浮动的原理与清除浮动</title>
</head>
<body style="border: 1px dashed #f30">
<style type="text/css" media="screen">
.box1{
    width:300px;
    height:200px;
    background:#f30;
    float: left;
}
.box2{
    width:300px;
    height:200px;
    background:blue;
     float: right;
}
.box3{
    width:900px;
    height:200px;
    background:#666;
    clear:both
}
</style>
<div class="box1"></div>
<div class="box2"></div>
<div class="box3"></div>
<span style="width:100px;height:200px;background:#f30;float:left"> php中文网 </span>
<!-- 行内元素添加浮动支持宽高 -->
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>子元素浮动引起的父级区块高度塌陷的解决方案</title>
</head>
<body>
<style type="text/css" media="screen">
.main{
    width:200px;
    height:200px;
    background:#f30;
    float:left;
}
.box{
    border:1px solid #f30;
    /* overflow:hidden; */
}
/*    .box:after{
        content: "";
        display:block;
        clear:both;
    } */
/* 方案1 */
/* 添加box宽度 */
/* 方案2 */
/* 给box添加overflow:hidden */
/* 方案3 */
/* 添加伪类 */
/* 方案4 */
/* 重新定义一个div设置清除他的浮动 */
</style>
<div class="box">
    <div class="main"></div>
    <div style="clear:both"> </div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>定位布局</title>
</head>
<style type="text/css" media="screen">
.center{
    width:1000px;
    margin:0 auto;
    background:#999;
    height:100px;
    text-align:center;
    line-height:100px;
}
.main{
    width:1000px;
    height:500px;
    margin:0 auto;
    background:blue;
    position:relative;
}
.main .left{
    width:200px;
    min-height:100%;
    background:#f30;
    position:absolute;
    left:0;
}
.main .right{
    width:200px;
    min-height:100%;
    background:#f30;
    position:absolute;
    right:0;
    top:0;
}
.content{
    margin:0 210px;
    background:#eee;
    min-height:100%;
}
</style>
<body>
<!-- 头部 -->
<div class="head center">头部</div>
<div class="main">
   <div class="left">左边</div>
   <div class="content">主体</div>
   <div class="right">右边</div>
</div>
<!-- 底部 -->
<div class="footer center">底部</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>经典的三列双飞翼布局</title>
</head>
<body>
<style type="text/css" media="screen">
.center{
    width:1000px;
    margin:0 auto;
    background:#999;
    height:100px;
    text-align:center;
    line-height:100px;
}
.container{
    width:1000px;
    height:600px;
    background:#f30;
    margin:0 auto;
}
.left{
    width:200px;
    min-height:100%;
    float:left;
    background:blue;
    margin-left:-1000px;
}
.right{
    width:200px;
    min-height:100%;
    float:left;
    background:blue;
    margin-left:-200px;
}
.wrap{
    width:100%;
    min-height:100%;
    float:left;
    background:#666;
}
.main{
    min-height:600px;
    margin:0 210px;
    background-color: wheat;
}
</style>
<!-- 头部 -->
<div class="head center">头部</div>
<div class="container">
   <div class="wrap">
       <div class="main">主体</div>
   </div>
   <div class="left">左边</div>
   <div class="right">右边</div>
</div>
<!-- 底部 -->
<div class="footer center">底部</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>圣杯布局</title>
</head>
<body>
<style type="text/css" media="screen">
.center{
    width:1000px;
    margin:0 auto;
    background:#999;
    height:100px;
    text-align:center;
    line-height:100px;
}
.container{
    width:600px;
    background:#f30;
    margin:auto;
    padding:0 200px;
    overflow:hidden;
}
.left{
    width:200px;
    min-height:600px;
    float:left;
    background:blue;
    margin-left: -100%;
    position:relative;
    left:-200px;
}
.right{
    width:200px;
    min-height:600px;
    float:left;
    background:blue;
    position:relative;
    margin-left:-200px;
    left:200px;
}
.wrap{
    width:100%;
    min-height:600px;
    background:#666;
    float:left;
}
</style>
<!-- 头部 -->
<div class="head center">头部</div>
<div class="container">
   <div class="wrap">
   </div>
   <div class="left">左边</div>
   <div class="right">右边</div>
</div>
<!-- 底部 -->
<div class="footer center">底部</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例

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