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jquery实现弹出即消失的提示层

<!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></title>     <meta charset="utf-8"/>     <script src="http://libs.baidu.com/jquery/1.9.0/jquery.min.js"></script>     <script type="text/javascript">         $(function () {             $("#btn").click(function () {                 $("#dv").slideToggle(200);                 setTimeout(function () {                     $("#dv").hide(200);                 }, 3000);             });         });     </script>     <style type="text/css">         div.RoundedCorner         {             background: #C8E2FA;         }         b.rtop, b.rbottom         {             display: block;             background: #FFFFFF;         }         b.rtop b, b.rbottom b         {             display: block;             height: 1px;             overflow: hidden;             background: #C8E2FA;         }         b.r1         {             margin: 0 5px;         }         b.r2         {             margin: 0 3px;         }         b.r3         {             margin: 0 2px;         }         b.rtop b.r4, b.rbottom b.r4         {             margin: 0 1px;             height: 2px;         }         #dv         {             width: 300px;             position: absolute;             top: 10px;             left: 39%;             z-index: 10001;             padding: 0;         }         .shade         {             display: none;         }     </style> </head> <body>     <div id="dv" class="shade">         <b class="rtop"><b class="r1"></b><b class="r2"></b><b class="r3"></b><b class="r4">         </b></b>         <div style=" height:100px; text-align:center; background-color:#C8E2FA;">         <br /><br />             <div style="height:30px; font-weight: bold; font-size:16px; background-color:#C8E2FA;">                 修改成功!             </div>         </div>          <b class="rbottom"><b class="r4"></b><b class="r3"></b><b class="r2">         </b><b class="r1"></b></b>     </div>     <input type="button" id="btn" value="点击" /> </body> </html>