Want To Use Javascript Functions While They Are Within Window.onload

The addEventListener doesn't add events, I found that I should use window.onload = function() { // whole code here } but, when I try to use the functions that are within the win

Solution 1:

You can explicitly assign the functions to the window inside the handler.

window.addEventListener('DOMContentLoaded', () => {
  window.someFn = () => {
    // ...
  };
  someFn();
  // you can also use someFn in the browser console
});