refactoring.js

refactoring.js

(() => {
    var refactoring = () => {
        var node = document.createTextNode("Refactored!");
        var body = document.getElementsByTagName("BODY")[0];
        if (body.hasChildNodes()) {
            body.insertBefore(node, body.firstChild);
        } else {
            body.appendChild(node);
        }
    };

    // If document was already ready then execute immediately
    if (document.readyState === "complete") {
        refactoring();
    } else { // If document is not ready then hook the event
        document.addEventListener("readystatechange", function (event) {
            if (document.readyState === "complete") {
                refactoring();
            }
        });
    }
}).call();