how to go back to top in html code example

Example 1: scroll to top

$("#scroll_icon").click(function()
	{
		jQuery('html,body').animate({scrollTop:0},2000);
	})

Example 2: javascript go to top of page

window.scroll({top: 0, left: 0});
//Or with jQuery
$('html,body').scrollTop(0);
//with animation
$('html, body').animate({ scrollTop: 0 }, 'fast');