//Instant scroll to top of page
window.scrollTo(0, 0);
window.scroll({
top: 0,
left: 0,
behavior: 'smooth'
});
window.scroll({top: 0, left: 0});
//Or with jQuery
$('html,body').scrollTop(0);
//with animation
$('html, body').animate({ scrollTop: 0 }, 'fast');