1. 实例演示如何消除子元素浮动造成父元素高度折叠的影响
实例
<!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>Document</title>
<link rel="stylesheet" href="/public/static/index/css/demo1.css?a={:time()}">
</head>
<style>
.div {
border: solid 2px red;
/* 使用overflow:hidden 来消除元素浮动对父类的影响 */
overflow: hidden;
padding: 20px;
}
.div>div {
float: left;
height: 500px;
width: 33.3%;
}
.left {
background: lightseagreen;
}
.content {
background: lightpink;
}
.right {
background: limegreen;
}
</style>
<body>
<div class="div">
<div class="left"></div>
<div class="content"></div>
<div class="right"></div>
</div>
</body>
</html>运行实例 »
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2. 实例演示三列布局的实现原理( 绝对定位实现, 浮动定位实现)
2. 实例演示三列布局的实现原理( 绝对定位实现, 浮动定位实现)
相对定位
实例
<!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>Document</title> <link rel="stylesheet" href="/public/static/index/css/demo1.css?a={:time()}"> </head> <style> .main { border: solid 2px red; /* 使用overflow:hidden 来消除元素浮动对父类的影响 */ overflow: hidden; height: 800px; } .main>div { height: 800px; width: 33.33%; text-align: center; line-height: 800px; } .left { background: lightseagreen; } .content { background: lightpink; position: relative; top: -800px; left: 33.33%; } .right { background: limegreen; position: relative; top: -1600px; left: 66.66%; } </style> <body> <div class="main"> <div class="left"> 左版块</div> <div class="content">内容区</div> <div class="right">右版块</div> </div> </body> </html>
运行实例 »点击 "运行实例" 按钮查看在线实例
绝对定位 实例
<!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>Document</title> <link rel="stylesheet" href="/public/static/index/css/demo1.css?a={:time()}"> </head> <style> .main { border: solid 2px red; /* 使用overflow:hidden 来消除元素浮动对父类的影响 */ height: 800px; margin: 0; padding: 0; position: relative; } body { margin: 0; padding: 0; } .main>div { height: 800px; width: 33.33%; text-align: center; line-height: 800px; } .left { background: lightseagreen; } .content { background: lightpink; position: absolute; top: 0px; left: 33.33%; } .right { background: limegreen; position: absolute; top: 0px; left: 66.66%; } </style> <body> <div class="main"> <div class="left"> 左版块</div> <div class="content">内容区</div> <div class="right">右版块</div> </div> </body> </html>
运行实例 »点击 "运行实例" 按钮查看在线实例