CSS清浮动
1.给父级也加浮动（内容一旦浮动就意味着脱离文档流，而父级始终保持原有状态，所以必须同时浮动）
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> .box{ width:300px;margin:0 auto;border:10px solid #000; float:left;} .div{ width:200px;height:200px;background:red;float:left;} /* 清浮动 1.给父级也加浮动(不居中了) */ </style> </head> <body> <div class="box"> <div class="div"></div> </div> </body> </html>
2.给父级加display:inline-block
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> .box{ width:300px;margin:0 auto;border:10px solid #000; display:inline-block;} .div{ width:200px;height:200px;background:red;float:left;} /* 清浮动 2.给父级加display:inline-block */ </style> </head> <body> <div class="box"> <div class="div"></div> </div> </body> </html>
3.加<div class="clear"></div>
.clear{ height:0px;font-size:0;clear:both;}但是在ie6下，块元素有最小高度，即当height<19px时，默认为19px，解决方法：font-size:0;或overflow:hidden;
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> .box{ width:300px;margin:0 auto;border:10px solid #000;} .div{ width:200px;height:200px;background:red;float:left;} .clear{ height:0px;font-size:0;clear:both;} /* 清浮动 1.给父级也加浮动 2.给父级加display:inline-block 3.在浮动元素下加<div class="clear"></div> .clear{ height:0px;font-size:0;clear:both;} */ </style> </head> <body> <div class="box"> <div class="div"></div> <div class="clear"></div> </div> </body> </html>
4.在浮动元素下加<br clear="all">
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> .box{ width:300px;margin:0 auto;border:10px solid #000;} .div{ width:200px;height:200px;background:red;float:left;} /* 清浮动 4.在浮动元素下加<br clear="all"/> */ </style> </head> <body> <div class="box"> <div class="div"></div> <br clear="all"/> </div> </body> </html>
5.伪类清除浮动
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> .box{margin:0 auto;border:10px solid #000;} .div{ width:200px;height:200px;background:red;float:left;} .clear{zoom:1;}//解决IE6问题 .clear:after{content:""; display:block;clear:both;} /* 清浮动 5. 给浮动元素的父级加{zoom:1;} :after{content:""; display:block;clear:both;} **在IE6，7下浮动元素的父级有宽度就不用清浮动 haslayout 根据元素内容的大小 或者父级的父级的大小来重新的计算元素的宽高 display: inline-block height: (任何值除了auto) float: (left 或 right) width: (任何值除了auto) zoom: (除 normal 外任意值) */ </style> </head> <body> <div class="box clear"> <div class="div"></div> </div> </body> </html>
6.给浮动元素父级加overflow:hidden;
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> .box{ width:300px;border:1px solid #000;overflow:hidden;} .div1{ width:260px;height:400px;background:Red;float:left;} </style> </head> <body> <div class="box"> <div class="div1"></div> </div> </body> </html>
