I have a page which height is 1500px, I want to open the page, then show the page from top to the bottom for a review, then back to the top. I use this jQuery animate code, but it can not work well. how to write correctly? Thanks.

jQuery(function(){
    $('body,html').animate({
    scrollTop:1500
   }, 3000)
   .animate({
    scrollTop:-1500
   }, 3000);
});