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使用css3制作导航及画圆及椭圆边框的实现

<!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> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title>  <style>  *{ margin:0px; padding:0px;}  .serch_left{ border-radius:20px;}     .serch ,.serch_left,.serch_right{ height:40px; }      .serch { width:500px; border:#000 0px solid; background:#09F; margin:50px;   border-radius:20px;}  .serch_left { width:390px; height:36px; border:#09F 2px solid; background:#FFF;}  .serch_right{ width:90px;}  .serch_left,.serch_right{  float:left; text-align:center;}  .serch_right{height:30px; padding-top:10px; color:#FFF; font-weight:bold; cursor:pointer;}      .inp_serch{ width:390px; padding-left:30px; background:url(img/serch.png) no-repeat 5px 5px; height:35px; border:0px; border-radius:20px; border-color:#FFF;   font-size:20px;}  </style>

  <script src="http://www.mamicode.com/js/jquery-1.8.3.min.js"></script>    <script >       $(function(){       $(".inp_serch").css("color","#CCC").focus(function(){           /*val() 能取得值  还可以 赋值*/      if($(this).val()==""){       $(this).val("搜索");       }                }).blur(function(){              if($(this).val()=="搜索"){        $(this).css("color","#CCC");      }else{         $(this).css("color","black");       }             });      $(".serch_right").click(function(){         alert($(".inp_serch").val());      });        });       </script>   

<style>       .yuan{ width:20px; height:20px; border-radius:20px; background-color:#F00;    color:#FFF; font-weight:bold; text-align:center; margin:5px; float:10px;}

   .cl{ width:200px; height:40px; border-top-left-radius:10px; border-bottom-right-radius:10px; border:#00F 2px solid;} </style>

</head>

<body>

<div class="yuan">1</div>   <div class="yuan">2</div>   <div class="yuan">3</div>   <div class="yuan">4</div>       <div class="cl"></div>        <div class="serch">       <div class="serch_left">         <input  type="text" class="inp_serch"/>             </div>       <div class="serch_right">搜索</div>   </div>

  </body> </html>