第一种PC端公共样式：
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, font, img, ins, kbd, q, s, samp, small, strike,
strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody,
tfoot, thead, tr, th, td ,textarea { margin:0; padding:0; }
address,cite,dfn,em,var, i {font-style:normal;}
body {font-size: 16px; line-height: 1.5; font-family:'Microsoft Yahei','simsun','arial','tahoma'; color: #222; background: #eee; }
table { border-collapse:collapse; border-spacing:0; }
h1, h2, h3, h4, h5, h6, th { font-size: 100%; font-weight: normal; }
button,input,select,textarea{font-size:100%;}
fieldset,img{border:0;}
a { text-decoration: none; color: #666; background: none }
ul, ol { list-style: none; }
:focus{ outline:none;}
.clearfix{ clear: both; content: ""; display: block; overflow: hidden }
.clear{clear: both;}
.fl{ float: left; }
.fr{float: right;}
第二种移动端公共样式：
/*reset*/
html{-webkit-text-size-adjust:100%;}
/*reset*/
html{max- 640px;margin:0 auto;}
article,aside,dialog,footer,header,section,footer,nav,figure,menu{display:block}
body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, figure, section, legend, textarea, p, blockquote, th, td, input, select, textarea, button { margin: 0; padding: 0 }
fieldset, img { border: 0 none }
body{font:14px/1.4 "Microsoft Yahei",Arial,Helvetica,sans-serif;background-color: #fff;color:#333;max- 640px;margin: 0 auto;}
h1,h2,h3,h4,h5,h6{font-size:100%;font-weight: normal;}
table{border-collapse:collapse;border-spacing:0}
ul,ol,dd,dt,dl{list-style-type:none;}
a{color:#333;text-decoration: none;-webkit-touch-callout: none;-webkit-user-select: none;}
a,input,select{-webkit-tap-highlight-color: transparent;-webkit-appearance: none;-moz-appearance: none;-webkit-border-radius: 0;}
input,img{border:none;}
i,em{font-style:normal;}
:focus{outline: none}
select{ background: none }
/*iphone6*/
@media(min-device-375px)and(max-device-667px)and(-webkit-min-device-pixel-ratio:2){body{font-size:14.5px;}}
/*iphone6plus*/
@media(min-device-414px) and (max-device-736px) and (-webkit-min-device-pixel-ratio:3){body{font-size:15.5px;}}
/*原子类*/
.clear { clear: both; }
.clear:after { display: block; clear: both; visibility: hidden; height: 0; overflow: hidden; content: "."; }
.fl { float: left; }
.fr { float: right; }
.mb10{margin-bottom: 10px;}
.mt10{margin-top: 10px;}
/*placeholder css*/
::-moz-placeholder{ font-family: "Microsoft YaHei"}
::-webkit-input-placeholder{ font-family: "Microsoft YaHei"}
:-ms-input-placeholder{ font-family: "Microsoft YaHei"}