div+css基础——4.div浮动引发的问题

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>div浮动引发的问题</title>
  <meta name="keywords" content="自定义关键字"/>
  <meta name="description" content="自定义描述"/>
  <meta http-equiv="content-type" content="text/html;charset=utf-8"/>
  <style type="text/css">
	body{
		margin:0 1px 2px 3px;
	}
	#father{
		background-color:#FFFF99;
		width:100%;
		height:100px;
		border:1px dashed green;
	}
	#son1{
		float:left;
	}
	#son2{
		float:left;
	}
	
	#son3{
		float:left;
	}
  </style>
 </head>
 <body>
	<div id="father">
		<div id="son1">aaaaaaaaaa</div>
		<div id="son2">bbbbbbbbbb</div>
		<div id="son3">cccccccccc</div>
		<div id="son4">dddddddddd</div><!--son4没有浮动,但它会受到上面浮动的印象,也跟着浮动了-->
	</div>
 </body>
</html>

效果截图:

解决方法:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>div浮动引发的问题</title>
  <meta name="keywords" content="自定义关键字"/>
  <meta name="description" content="自定义描述"/>
  <meta http-equiv="content-type" content="text/html;charset=utf-8"/>
  <style type="text/css">
	body{
		margin:0 1px 2px 3px;
	}
	#father{
		background-color:#FFFF99;
		width:100%;
		height:100px;
		border:1px dashed green;
	}
	#son1{
		float:left;
	}
	#son2{
		float:left;
	}
	
	#son3{
		float:left;
	}
	#clear{
		clear:both;	/*解决方法:清除浮动*/
	}
  </style>
 </head>
 <body>
	<div id="father">
		<div id="son1">aaaaaaaaaa</div>
		<div id="son2">bbbbbbbbbb</div>
		<div id="son3">cccccccccc</div>
		<div id="clear"></div>
		<div id="son4">dddddddddd</div><!--son4没有浮动,但它会受到上面浮动的印象,也跟着浮动了-->
	</div>
 </body>
</html>

效果截图:

posted @ 2013-05-26 16:28  魅惑之眼  阅读(157)  评论(0编辑  收藏  举报