高效的CSS代码(1)

body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td{margin:0; padding:0; } 
table{border-collapse: collapse; border-spacing:0; }
fieldset,img{border:0; }
address,caption,cite,code,dfn,em,strong,th,var{font-style:normal; font-weight:normal; }
ol,ul{list-style:none; }
caption,th{text-align:left; }
h1,h2,h3,h4,h5,h6{font-size:100%; font-weight:normal; }
q:before,q:after{content:‘‘; }

/* 文字排版 */
 .f12{font-size:12px;}
.f13{font-size:13px;}
.f14{font-size:14px;}
.f16{font-size:16px;}
.f20{font-size:20px;}
.fb{font-weight:bold;}
.fn{font-weight:normal;}
.t2{text-indent:2em;}
.lh150{line-height:150%;}
.lh180{line-height:180%;}
.lh200{line-height:200%;}
.unl{text-decoration:underline;}
.no_unl{text-decoration:none;}
/*定位*/
.tl{text-align: left;}
.tc{text-align: center;}
.tr{text-align:right;}
.bc{margin-left:auto; margin-right:auto;}
.fl{float:left;display:inline;}
.fr{folat:right;display:inline;}
.cb{clear:both;}
.cr{clear:right;}
.cl{clear:left;}
/*clearfix是为了在父容器直接清除子元素浮动，让浮动元素的父容器能根据浮动元素的高度而自适应高度，把这个clearfix
给父容器挂上*/
.clearfix:after{content:‘.‘;display:block;height:0;clear:both;visibility:hidden;}
.clearfix{display: inline-block}*html
.clearfix{height:1%;}
.Clearfix{display:block;}
.vm{vertical-align:middle;}
.pr{position:relative;}
.pa{position:absolute;}
.pf{position:fixed;}
.abs-right{position: absolute;right: 0;}/*this character i haven‘t uesd*/
.zoom{zoom:1;}/*用于LAYOUT的启动*/
.hidden{visibility:hidden;}
.none{display:none;}
/*width height*/
.w10{width:10px;} 
.w20{width:20px;} 
.w30{width:30px;} 
.w40{width:40px;} 
.w50{width:50px;} 
.w60{width:60px;} 
.w70{width:70px;} 
.w80{width:80px;} 
.w90{width:90px;} 
.w100{width:100px;} 
.w200{width:200px;} 
.w250{width:250px;} 
.w300{width:300px;} 
.w400{width:400px;} 
.w500{width:500px;} 
.w600{width:600px;} 
.w700{width:700px;} 
.w800{width:800px;} 
.w{width:100%}
.h50{height:50px;}
.h80{height:80px;}
.h100{height:100px;}
.h200{height:200px;}
.h{height:100%;}
/*margin padding*/
.m10{margin:10px;}
.m15{margin:15px;}
.m30{margin:30px;}
.mt5{margin-top:5px;}
.mt10{margin-top:10px;}
.mt15{margin-top:15px;}
.mt20{margin-top:20px;}
.mt30{margin-top:30px;}
.mt50{margin-top:50px;}
.mt100{margin-top:100px;}
.mb5{margin-bottom:5px;}
.mb10{margin-bottom:10px;}
.mb15{margin-bottom:15px;}
.mb20{margin-bottom:20px;}
.mb30{margin-bottom:30px;}
.mb50{margin-bottom:50px;}
.mb100{margin-bottom:100px;}
.mr5{margin-right:5px;}
.mr10{margin-right:10px;}
.mr15{margin-right:15px;}
.mr20{margin-right:20px;}
.mr30{margin-right:30px;}
.mr50{margin-right:50px;}
.mr100{margin-right:100px;}
.ml5{margin-left:5px;}
.ml10{margin-left:10px;}
.ml15{margin-left:15px;}
.ml20{margin-left:20px;}
.ml30{margin-left:30px;}
.ml50{margin-left:50px;}
.ml100{margin-left:100px;}
.p10{padding:10px;}
.p15{padding:15px;}
.p30{padding:30px;}
.pt5{padding-top:5px;}
.pt10{padding-top:10px;}
.pt15{padding-top:15px;}
.pt20{padding-top:20px;}
.pt30{padding-top:30px;}
.pt50{padding-top:50px;}
.pb5{padding-bottom:5px;}
.pb10{padding-bottom:10px;}
.pb15{padding-bottom:15px;}
.pb20{padding-bottom:20px;}
.pb30{padding-bottom:30px;}
.pb50{padding-bottom:50px;}
.pb100{padding-bottom:100px;}
.pl5{padding-left:5px;}
.pl10{padding-left:10px;}
.pl15{padding-left:15px;}
.pl20{padding-left:20px;}
.pl30{padding-left:30px;}
.pl50{padding-left:50px;}
.pl100{padding-left:100px;}
.pr5{padding-right:5px;}
.pr10{padding-right:10px;}
.pr15{padding-right:15px;}
.pr20{padding-right:20px;}
.pr30{padding-right:30px;}
.pr50{padding-right:50px;}
.pr100{padding-right:100px;}