Display a random cat on a website using random.cat

randomcat.js

// Create an image in HTML with the ID "catimg"
document.getElementById("catimg").style.display = "none";
function getcat() {
    let rURL = "http://aws.random.cat/meow";
    let r = new XMLHttpRequest();
    r.open("GET", rURL);

    r.responseType = "json";
    r.send();

    r.onload = function() {
        let jsonObj = r.response;
        let img = document.getElementById("catimg");
        img.src = jsonObj["file"];
        img.style.display = "inline-block";
    }
}
getcat();