mảng nâng cao tin học 11
#goTop { cursor: pointer; display: none; position: fixed; right: 50px; bottom: 100px; z-index: 1000; } $(function(){ $(window).scroll(function () { if ($(this).scrollTop() > 100) $('#goTop').fadeIn(); else $('#goTop').fadeOut(); }); $('#goTop').click(function () { $('body,html').animate({scrollTop: 0}, 'slow'); }); });