jQuery实现导航回弹效果

效果图：

代码如下：

<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title></title>
 <script src="http://www.21kevin.com/js/jquery-1.8.3.min.js" type="text/javascript" charset="utf-8"></script>
 <script src="http://www.21kevin.com/js/move.js" type="text/javascript" charset="utf-8"></script>
 <style type="text/css">
  *{margin:0;padding:0;}
  .box{width:1100px ;height: 70px;margin: 100px auto;background: hotpink;padding: 0 0 0 200px;box-sizing: border-box;}
  .nav {float: left;height: 70px;line-height: 55px;position: relative;cursor: pointer;}
  .nav-now{background: url(images/nav_now_bg.png)center 50px no-repeat;}
  .nav h1{font-size: 24px;}
  .box .nav+.nav{margin-left: 50px;}
  .box .nav span{width: 25px;height: 25px;position: absolute;background: url(images/nav_xiajiantou.png)center no-repeat;top: 15px;right: -35px;}
  .nav ul{position: absolute;background: hotpink;width: 160px;top: 70px;left: -15px;display: none;}
  .nav ul li{list-style: none;line-height: normal;padding: 10px 0 10px 20px;cursor: pointer;transition:padding-left 0.5s ease; }
  .nav ul li:hover{background: yellowgreen url(images/nav_li_bg.png)142px center no-repeat;padding-left:35px ;}
  .nav:hover{background: url(images/nav_now_bg.png)center 50px no-repeat;}
 </style>
 </head>
 <body>
 <div class="box">
  <div class="nav has-nav nav-now">
  <h1>一级菜单</h1>
  <span></span>
  <ul>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
  </ul>
  </div>
  <div class="nav has-nav">
  <h1>一级菜单</h1>
  <span></span>
  <ul>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
  </ul>
  </div>
  <div class="nav has-nav">
  <h1>一级菜单</h1>
  <span></span>
  <ul>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
   <li>二级菜单</li>
  </ul>
  </div>
  <div class="nav">
  <h1>一级菜单</h1>
  </div>
 </div>
 </body>
 <script>
 $(function(){
  $(".has-nav").hover(function(){
  $(this).find('ul').slideDown(600,"elasticOut");
  },function(){
  $(this).find('ul').stop().slideUp(100);
  });
 $(".nav").click(function(){
  $(this).addClass("nav-now").siblings().removeClass("nav-now")
 })
 })
 </script>
</html>

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