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
父元素添加overflower,用来清浮动。
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)
绝对定位
实例
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <link rel="stylesheet" href="css/css.css"> <title>Document</title> </head> <body> <div class="container"> <div class="top">头部</div> <div class="main"> <div class="left">左侧</div> <div class="content">内容</div> <div class="right">右侧</div> </div> <div class="boot">底部</div> </div> </body> </html>
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实例
.container { width: 1000px; margin: 0 auto; } .top { height: 40px; background-color: lightgrey; } .boot { height: 40px; background-color: lightgrey; } .main { /*min-height: 800px;*/ margin: 5px auto; background-color: lightblue; } .left { width: 200px; min-height: 800px; background-color: lightgreen; } .content { min-height: 800px; background-color: lightseagreen; } .right { width: 200px; min-height: 800px; background-color: lightpink; } .main { position: relative; } .left { position: absolute; left: 0; top: 0; } .right { position: absolute; right: 0; top: 0; } .content { margin-left: 210px; margin-right: 210px; }
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浮动定位实现
实例
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <link rel="stylesheet" href="css/css.css"> <title>Document</title> </head> <body> <div class="container"> <div class="top">头部</div> <div class="main"> <div class="left">左侧</div> <div class="content">内容</div> <div class="right">右侧</div> </div> <div class="boot">底部</div> </div> </body> </html>
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实例
.container { width: 1000px; margin: 0 auto; } .main { margin: 5px auto; background-color: lightblue; } .top { height: 60px; background-color: lightgrey; } .boot { height: 60px; background-color: lightgrey; } .left { width: 200px; min-height: 800px; background-color: lightgreen; } .content { min-height: 800px; background-color: lightseagreen; } .right { width: 200px; min-height: 800px; background-color: lightpink; } .left { float: left; } .right { float: right; } .content { float: left; width: 580px; margin-left: 10px; } .main { overflow: hidden; }
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float: left; 就是向左浮动
float: right; 就是向右浮动
overflow: hidden; 就是清除浮动
绝对定位用 position 浮动定位用 float