On-Load Functions, when page is fully loaded (JS)

onload.js

<script>

(function () {
	function ready(fn) {
		if (document.attachEvent ? document.readyState === "complete" : document.readyState !== "loading"){
			fn();
		} else {
			document.addEventListener('DOMContentLoaded', fn);
		}
	}

	function init() {
		console.log("We are ready now!");
	}

	ready(init);
})();

// ----------------- OR

window.onload = function() {

  console.log('Page is fully loaded');
};

// ----------------- OR

window.addEventListener('load', (event) => {

  console.log('Page is fully loaded');
});



</script>