// javascript
$(function() {
  $window = $(window);
  $link = $("#scrollToTop"); // your link to show when user scrolls down
$link.click(function() {
 $("html, body").animate({ scrollTop: 0 }, "slow"); // this is the gist of the script, scroll to top (scrollTop: 0)
});

$window.scroll(function() {
   if ($window.scrollTop() <= 0) {
     $link.fadeOut("fast");
   } else {
     $link.fadeIn("fast");
     }
})

// css
#scrollToTop:link, 
#scrollToTop:visited {
  display: none;
  position: fixed;
  top: 15px;
  right: 15px;
  padding: 10px 20px;
  font-size: 16px;
  font-weight: bold;
  text-decoration: none;
  background: #ccc;
  color: #333;
  -moz-border-radius: 10px;
  -webkit-border-radius: 10px;
  border-radius: 10px;
}

$(function() {
  $window = $(window);
  $link = $("#scrollToTop"); // your link to show when user scrolls down
$link.click(function() {
 $("html, body").animate({ scrollTop: 0 }, "slow"); // this is the gist of the script, scroll to top (scrollTop: 0)
});

$window.scroll(function() {
   if ($window.scrollTop() <= 0) {
     $link.fadeOut("fast");
   } else {
     $link.fadeIn("fast");
     }
})

jQuery: Scroll To Top

jquery

JavaScript