关于 clear 其实可以参考 http://www.zhangxinxu.com/wordpress/2014/06/understand-css-clear-left-right-and-use/ 这篇文章
2015-09-29
#wrap{width:970px; margin:0 auto;}
#mainbody{position:relative; margin-top:15px;}
#left{float:left; width:110px; }
#mid{margin-left:123px;width:650px;border:1px solid #999;}
#right{position:absolute; top:0; left:793px; border:1px solid #999;}
#mainbody{position:relative; margin-top:15px;}
#left{float:left; width:110px; }
#mid{margin-left:123px;width:650px;border:1px solid #999;}
#right{position:absolute; top:0; left:793px; border:1px solid #999;}
2015-09-27