how to make a scroll up button code example

Example 1: scroll to top

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

Example 2: simple button scrolling with this

// Select all »a« elements with a parent tag »nav« and add a function that is executed on click
$('#id a').on('click', function (e) {

   // Define variable of the clicked »a« element (»this«) and get its href value.
   var href = $(this).attr('href')

   // Run a scroll animation to the position of the element which has the same id like the href value.
   $('html, body').animate({
      scrollTop: $(href).offset().top
   }, '300')

   // Prevent the browser from showing the attribute name of the clicked link in the address bar
   e.preventDefault()

})