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                <!DOCTYPE html>
        <title>Cours jQuery</title>
        <meta charset="utf-8">
            <label for='prenom'>Entrez un prenom : </label>
            <input type='text' id='prenom' name='prenom'>
        <p>Valeur de l'input : <span id="valInput"></span></p>
            <select multiple='multiple'>
                <option>Option 1</option>
                <option>Option 2</option>
                <option>Option 3</option>
        <p>Valeur du select : <span id="valSelect"></span></p>




    /*Dès qu'un utilisateur relâche une touche, la valeur de #prenom est 
    récupérée et affichée dans #valInput*/
        let valeurInput = $(this).val();
    /*Dès que la valeur change, c'est-à-dire dès qu'une sélection est faite,
    affiche les valeurs sélectionnées dans #val select*/
        let valeurSelect = $('select').val();

        //join() permet de récupérer les valeurs d'un tableau sous forme de chaine
        $('#valSelect').text(valeurSelect.join(', '));