参考了天猫、微博等网站的做法，用纯html和css实现，效果还是不错的。
以下是成果，兼容主流浏览器，包括ie6。
CSS Code复制内容到剪贴板 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="zh-CN" /> <meta name="Keywords" content="" /> <meta name="Description" content="" /> <title></title> </head> <style type="text/css"> *{margin:0; padding:0; list-style:none; font:normal 12px/150% 宋体; } body{ padding:20px; } .arrow{ margin-bottom:20px; } .arrow,.arrow s { position:relative; display:block; font-size: 0; line- height: 0; width: 0; height: 0; border-color:transparent; border-style:dashed; border-width:5px; } .arrowR,.arrowR s{ border-left-color:#aaa; border-left-style:solid; } .arrowR s{ border-left-color:#fff; position:absolute; left:-7px; top:-5px; } .arrowR:hover{ border-left-color:#f60; } .arrowL,.arrowL s{ border-right-color:#aaa; border-right-style:solid; } .arrowL s{ border-right-color:#fff; position:absolute; rightright:-7px; top:-5px; } .arrowL:hover{ border-right-color:#f60; } .arrowT,.arrowT s{ border-bottom-color:#aaa; border-bottom-style:solid; } .arrowT s{ border-bottom-color:#fff; position:absolute; left:-5px; top:-3px; } .arrowT:hover{ border-bottom-color:#f60; } .arrowB,.arrowB s{ border-top-color:#aaa; border-top-style:solid; } .arrowB s{ border-top-color:#fff; position:absolute; left:-5px; bottombottom:-3px; } .arrowB:hover{ border-top-color:#f60; } .circle{ line-height:100%; overflow:hidden; font- family:Tahoma,Helvetica; font-size:18px; color:#aaa; } .circle:hover{ color:#f60; } .tipBox{ width:200px; margin-top:10px; } .tipBox .hd{ height:5px; position:relative; } .tipBox .hd .arrow{ position:absolute; top:-5px; left:10px; } .tipBox .hd .arrow s{ top:-4px; } .tipBox .bd{ border:1px solid #aaa; padding:10px; -webkit-border- radius:5px; -moz-border-radius:5px; border-radius:5px; } .tipBoxA .arrow s{ border-bottom-color:#f6f6f6; } .tipBoxA .bd{ background:#f6f6f6; } </style> <body> <a class="arrow arrowR"></a> <a class="arrow arrowL"></a> <a class="arrow arrowT"></a> <a class="arrow arrowB"></a> <a class="arrow arrowR"><s></s></a> <a class="arrow arrowL"><s></s></a> <a class="arrow arrowT"><s></s></a> <a class="arrow arrowB"><s></s></a> <a class="circle">?</a> <div class="tipBox"> <div class="hd"> <s class="arrow arrowT"><s></s></s> </div> <div class="bd"> 用css做的提示盒子，上三角是纯css，盒子圆角用到css3 </div> </div> <div class="tipBox tipBoxA"> <div class="hd"> <s class="arrow arrowT"><s></s></s> </div> <div class="bd"> 用css做的提示盒子，上三角是纯css，盒子圆角用到css3 </div> </div> </body> </html> 
