<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> .clear { zoom:1; } .clear:after { content:''; display:block; clear:both; } .wrap { padding-bottom:10px; } #div1 { 100px; height:100px; background:red; float:left; } #div2 { 200px; height:100px; background:yellow; } </style> </head> <body> <div class="wrap clear"> <div id="div1"></div> </div> <div id="div2"></div> </body> </html>
上面的css代码中如果给div1加margin-bottom是没用的，解决办法就是给div1的父级家padding-bottom