情况如题，下面请看JS，后面会跟HTML以及CSS，同时调用了jquery库
// JS开始
// //
//
* {margin:0; padding:0;}
body {font-size:12px; color:#222; font-family:Verdana,Arial,Helvetica,sans-serif; background:#f0f0f0;}
.clearfix:after {content: "."; display: block; height: 0; clear: both; visibility: hidden;}
.clearfix {zoom:1;}
ul,li {list-style:none;}
img {border:0;}
.wrapper {width:600px; margin:0 auto; padding-bottom:50px;}
.wrapper {width:780px;}
/* tmall flash */
.flash {width:300px; height:200px; overflow:hidden; position:relative;}
.flash ul {height:200px; position:absolute;}
.flash ul li {float:left; width:300px; height:200px; overflow:hidden; position:relative; background:#000;}
.flash ul li div {position:absolute; overflow:hidden;}
.flash .btnBg {position:absolute; width:300px; height:20px; left:0; bottom:0; background:#000;}
.flash .btn {position:absolute; width:290px; height:20px; left:0; bottom:0; padding-left:10px;}
.flash .btn span {display:inline-block; _display:inline; _zoom:1; width:18px; height:18px; line-height:18px; text-align:center; font-size:14px; font-family:"Microsoft YaHei",SimHei; margin-right:10px; cursor:pointer; color:#fff;}
.flash .btn span.on {background:#000; color:#fcc;}
//
//-
//
-
// 
// 
// 
//