how to load a javascript function on page load code example

Example 1: JavaScript that executes after page load

//two ways of executing JS code after page is loaded, use "DOMContentLoaded" when able

document.addEventListener("DOMContentLoaded", function(){
    //dom is fully loaded, but maybe waiting on images & css files
});

window.addEventListener("load", function(){
    //everything is fully loaded, don't use me if you can use DOMContentLoaded
});

Example 2: javascript load page

window.location = "https://example.com/";

Example 3: run on load js

function codeAddress() {
            alert('ok');
        }
window.onload = codeAddress;