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                /*La fonction loadScript() crée un nouvel élément script et ajoute la
 *valeur passée en argument à l'attribut src puis insère l'élément script
 *dans l'élément head de notre fichier HTML*/
function loadScript(src, callback) {
    let script = document.createElement('script');
    script.src = src;
    script.onload = () => callback(script);

loadScript('boucle.js', function(script){
    alert('Le fichier ' + script.src + ' a bien été chargé. x vaut : ' + x);
    loadScript('script2.js', function(script){
        //Utilise les éléments du script boucle.js pour effectuer des opérations...
        alert('Le fichier ' + script.src + ' a bien été chargé');
        loadScript('script3.js', function(script){
            /*U*tilise les éléments des scripts boucle.js et script2.js
             *pour effectuer des opérations...*/
            alert('Le fichier ' + script.src + ' a bien été chargé');

alert('Message d\'alerte du script principal');