load-script.js

if (!url) {
    url = "https://ecraft2learn.github.io/ai/ecraft2learn.js";
}
if (!reload && window.ecraft2larn_scripts_loaded && window.ecraft2learn_scripts_loaded.indexOf(url) >= 0) {
    if (typeof callback === 'object') {
       invoke(callback, new List([]));
    };
} else {
    var script = document.createElement("script");
    script.type = "text/javascript";
    script.src = url;
    script.addEventListener('load', function () {
        if (typeof callback === 'object') {
           invoke(callback, new List([]));
        };
        if (window.ecraft2learn_scripts_loaded && window.ecraft2learn_scripts_loaded.indexOf(url) < 0) {
            window.ecraft2learn_scripts_loaded.push(url);
        } else {
            window.ecraft2learn_scripts_loaded = [url];
        }
    });
    document.head.appendChild(script);
}