基于jQuery实现的菜单切换效果

<div class="active"> 
  <ul class="dropdown-menu" role="menu"> 
    <li data-submenu-id="submenu-patas"><a href="#">服装服饰</a></li> 
    <li data-submenu-id="submenu-snub-nosed"><a href="#"> 箱包配饰</a></li> 
    <li data-submenu-id="submenu-duoc-langur"><a href="#">数码家电</a></li> 
    <li data-submenu-id="submenu-pygmy"><a href="#">美容护发</a></li> 
    <li data-submenu-id="submenu-tamarin"><a href="#">母婴用品</a></li> 
    <li data-submenu-id="submenu-monk"><a href="#">家居建材</a></li> 
    <li data-submenu-id="submenu-gabon"><a href="#">食品百货</a></li> 
    <li data-submenu-id="submenu-grivet"><a href="#">户外汽车</a></li> 
    <li data-submenu-id="submenu-red-leaf"><a href="#">文化玩乐</a></li> 
    <li data-submenu-id="submenu-king-colobus"><a href="#">生活服务</a></li> 
  </ul> 
</div> 

<div id="submenu-patas" class="popover"> 
任意html代码 
</div> 

.active{position:relative} 
.dropdown-menu { position: absolute; 
 z-index: 1000;float: left; 
 min-width: 120px;padding: 5px 0;margin: 2px 0 0;list-style: none; 
 background-color: #ffffff;border: 1px solid #ccc; 
 -webkit-border-radius: 6px;-moz-border-radius: 6px;border-radius: 6px; 
 -webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);-moz-box-shadow: 0 5px 10px 
rgba(0, 0, 0, 0.2);box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2); 
} 
.dropdown-menu li{height:24px; line-height:24px; text-align:center} 
.dropdown-menu li a{display:block} 
.dropdown-menu li a:hover{color:#fff; text-decoration:none; background:#39f} 
.popover { 
 position: absolute;top: 0;left: 0; z-index: 1010;display: none; 
 width: 320px;-webkit-border-radius: 6px;-moz-border-radius: 6px;border-radius: 6px; 
 -webkit-border-top-left-radius: 0px;-webkit-border-bottom-left-radius: 0px; 
 border-top-left-radius: 0px;border-bottom-left-radius: 0px;overflow: hidden;    
 padding: 1px 1px 1px 15px;text-align: left;white-space: normal; 
 background-color: #fff;border: 1px solid #ccc; 
 border: 1px solid rgba(0, 0, 0, 0.2); 
 webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);-moz-box-shadow: 0 5px 10px 
rgba(0, 0, 0, 0.2);box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2); 
} 

$(function(){ 
   $(".dropdown-menu").menuAim({ 
      activate: activateSubmenu,//触发主菜单，显示子菜单 
      deactivate: deactivateSubmenu //离开主菜单，隐藏子菜单 
   }); 
}); 

var $menu = $(".dropdown-menu"); 
 
function activateSubmenu(row) { 
  var $row = $(row), 
  submenuId = $row.data("submenuId"), 
  $submenu = $("#" + submenuId), 
  offset = $menu.offset(), 
  height = $menu.outerHeight(), 
  width = $menu.outerWidth(); 
 
  $submenu.css({ //设置子菜单样式 
     display: "block", //显示子菜单 
     top: offset.top, 
     left: offset.left + width - 5, 
     height: height - 4  
  }); 
  //设置主菜单样式（鼠标滑向主菜单时） 
  $row.find("a").addClass("maintainHover"); 
} 
 
function deactivateSubmenu(row) { 
  var $row = $(row), 
  submenuId = $row.data("submenuId"), 
  $submenu = $("#" + submenuId); 
 
  $submenu.css("display", "none"); //隐藏子菜单 
  $row.find("a").removeClass("maintainHover");恢复主菜单样式 
}