html - make two similar javascript functions work together -


i started javascript recently. found piece of code changes class of object on scroll using pure javascript. here code - 

window.onscroll = function() {   if (window.scrolly > 1) {     document.getelementbyid('nav2').classname = "after";   } else {       document.getelementbyid('nav2').classname = "before";   }}; window.onscroll = function() {   if (window.scrolly > 1) {     document.getelementbyid('list').classname = "ul2";   } else {       document.getelementbyid('list').classname = "ul";   }};

the problem in code second function runs , first 1 not run until remove second function. please suggest pure javascript method solve issue

problem because when saying second time window.onscroll=somefun it's overwriting existing one. call second function onscroll.

just write every thing in 1 function bellow

window.onscroll = function() {   if (window.scrolly > 1) {     document.getelementbyid('nav2').classname = "after";     document.getelementbyid('list').classname = "ul2";   } else {       document.getelementbyid('nav2').classname = "before";       document.getelementbyid('list').classname = "ul";   }};

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