Implementation of Return Top button in JavaScript

Cool back to top function

JS Core Code

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Window.onscroll = function () {var t = Document.documentel Ement.scrolltop | | Document.body.scrollTop; var top_div = document.getElementById ("Go"); if (t >=) {top_div.style.display = "block";} else {top_div.style.display = "none";}}     VAR ptt=20; function PageScroll () {  document.getElementById (' Flypig '). style.display= ' block '; Window.scrollby (0,-10); Each up 10px       if (document.body.scrolltop==0) {document.getElementById (' Flypig '). style.marginbottom= ptt+ ' px '; ptt=ptt+10; } scrolldelay = settimeout (' PageScroll () ', 2); 2 ms Repeat execution once   if (ptt>=1000) {ptt=0; document.getElementById (' Flypig '). style.marginbottom=20+ ' px '; document.getElementById (' Flypig '). style.display= ' None '; Cleartimeout (scrolldelay); }//pagescroll ends}

Html

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<! DOCTYPE html>

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