load-script.js

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