thinkasync.js

/**
 * Created by Madila on 05/10/2016.
 */
class Async {
    constructor(id) {
        this.url = url;
        this.id = id;
    }

    add(url) {
        let doc = document;

        if (doc.getElementById(this.id)) {return;}
        
        let fjs = doc.getElementsByTagName(script)[0],
            js = doc.createElement(script);
        
        js.src = url;
        js.async = true;
        
        js.onload = js.onreadystatechange = function() {
            console.log(id+'-loaded', [id]);
        };
        id && (js.id = id);
        fjs.parentNode.insertBefore(js, fjs);
    };
}