, element) {
if($(element).children('li').length == 1){
$(element).hide();
}
});
//屏幕滚动时导航透明
$(window).scroll(function(e) {
var top = $(document).scrollTop();
if(top > 0){
if($('.nav-layer').css("opacity") != "0.95"){
$('.nav-layer').css("opacity", "0.95");
}
}else{
if($('.nav-layer').css("opacity") != "1"){
$('.nav-layer').css("opacity", "1");
}
}
});
});