scroll to bottom jquery not working properly

I have simple on code to see if bottom of page is reached alert. but its not working as I wanted.

I scroll down and come again to top, then is showing alert box. below is the code.

$(document).ready(function () {
    $(window).scroll(function () {
        if ($(window).scrollTop() + $(window).height() == $(document).height()) {


I finally came with this solution

$(window).scroll(function() {
  if (document.body.scrollHeight ==  document.body.scrollTop +  window.innerHeight) {


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