//判断系统
var os = function() {  
     var ua = navigator.useragent,  
     iswindowsphone = /(?:windows phone)/.test(ua),  
     issymbian = /(?:symbianos)/.test(ua) || iswindowsphone,   
     isandroid = /(?:android)/.test(ua),   
     isfirefox = /(?:firefox)/.test(ua),   
     ischrome = /(?:chrome|crios)/.test(ua),  
     istablet = /(?:ipad|playbook)/.test(ua) || (isandroid && !/(?:mobile)/.test(ua)) || (isfirefox && /(?:tablet)/.test(ua)),  
     isphone = /(?:iphone)/.test(ua) && !istablet,  
     ispc = !isphone && !isandroid && !issymbian;  
     return {  
          istablet: istablet,  
          isphone: isphone,  
          isandroid : isandroid,  
          ispc : ispc  
     };  
}(); 

//二级导航
$(document).ready(function(){
  if(os.isandroid || os.isphone){

  }
  else
  {
    $(document).off('click.zui.dropdown.data-api');
  }
  //自动展开
  $('.nav .dropdown').mouseenter(function(){
   $(this).addclass('open');
  });
  //自动关闭
  $('.nav .dropdown').mouseleave(function(){
   $(this).removeclass('open');
  });
});