DIV+CSS 清除浮动是页面布局中常见的问题，相信各位高手也都有自己的方法，今天在这里对常见的几种方法进行总结（PS：谈不上是原创，这里是我自己做的归纳总结，也是我自己内化的过程），希望对您能够有所帮助。感谢博客园平台！---- 来自
DIV+CSS 浮动效果是指，父元素在未定义高的情况下，由于子元素全部浮动脱离文本流，而造成父元素高的塌陷（PS:正常情况下，父元素的高是由子元素撑起来）；或者因为部分子元素的而浮动，脱离文本流而造成其他元素的布局错乱的情况。
DIV+CSS 清除浮动 常见的方法如下：
1、给未加浮动的子元素的CSS添加 clear: both;若子元素都有浮动时，可以新增加一个空的子元素，并且给其的CSS添加 clear: both;这样可以利用清除左右浮动的子元素重新撑起父元素的高，从而达到清除浮动的效果。代码及效果如下：
<style type="text/css"> .fl{float:left;} .demo{background:#ccc;} .item1{background:#F571E3;height:100px;width:100px;} .item2{background:#21B2F7;height:200px;width:100px;clear: both;} </style> </head> <body> <h2 id="用-clearfix-清除浮动">用 clearfix 清除浮动</h2> <div class="demo"> <div class="fl item1"></div> <div class="item2"></div> </div> </body> 清除浮动前，item1左浮动的效果（此时父元素的高是被未浮动的item2元素的高撑开）：
清除浮动前，item1右浮动的效果（此时父元素的高是被未浮动的item2元素的高撑开）：
清除浮动后的效果（因为DIV是块级元素，会独占一行，所以item2会在下面一行，此时父元素的高是被item1元素和item2元素的高撑开）：
2、子元素全部浮动时，给父元素的CSS添加 overflow: hidden;（子元素没有全部浮动时，不浮动的元素会撑开父元素的高，但是由于浮动元素造成的布局应该再利用padding进行修改），但是此方法父元素不能改使用position进行定位，否则不起作用。代码及效果如下：
<style type="text/css"> .fl{float:left;} .demo{background:#ccc;overflow: hidden;} .item1{background:#F571E3;height:100px;width:100px;} .item2{background:#21B2F7;height:200px;width:100px;} </style> </head> <body> <div class="demo"> <div class="fl item1"></div> <div class="fl item2"></div> </div> </body> 清除浮动前的效果，由于父元素的高塌陷，所以背景 background:#ccc; 没有起效果：
清除浮动后的效果：
3、给父元素加 伪类:after 和 zoom，代码及效果如下：
<style type="text/css"> .fl{float:left;} .demo{background:#ccc;zoom: 1;} .demo:after{display:block;clear:both;content:"";visibility:hidden;height:0}.item1{background:#F571E3;height:100px;width:100px;} .item2{background:#21B2F7;height:200px;width:100px;} </style> </head> <body> <div class="demo"> <div class="fl item1"></div> <div class="fl item2"></div> </div> </body> 清除浮动前的效果，由于父元素的高塌陷，所以背景 background:#ccc; 没有起效果：
清除浮动后的效果：
4、如果是在使用bootstrapt，则可以给其父元素添加class 为 clearfix 的类，代码及效果如下：
<style type="text/css"> .fl{float:left;} .demo{background:#ccc;} .item1{background:#F571E3;height:100px;width:100px;} .item2{background:#21B2F7;height:200px;width:100px;} </style> </head> <body> <div class="demo clearfix"> <div class="fl item1"></div> <div class="fl item2"></div> </div> </body> 清除浮动后的效果：
以上方法各有利弊，大家可以根据自己的理解选择使用，还有一些其他的清除浮动的方法，例如让父元素浮动、让父元素 display:table 等等其他，个人并不推荐使用。
希望以上的介绍对您能有所帮助，如有错误还请各位大神指正，感谢博客园平台！----来自
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