js document on load

1//two ways of executing JS code after page is loaded, use "DOMContentLoaded" when able
2
3document.addEventListener("DOMContentLoaded", function(){
4    //dom is fully loaded, but maybe waiting on images & css files
5});
6
7window.addEventListener("load", function(){
8    //everything is fully loaded, don't use me if you can use DOMContentLoaded
9});

1window.addEventListener('load', (event) => {
2  console.log('page is fully loaded');
3});

1window.onload = function() {
2  // Code here
3}

1//use
2window.onload=()=>{};

1document.onload = function ...
2