Class my extension

class myExtension_Admin{
    function __ construct() {
        add_action( 'admin_enqueue_scripts', array( &$this, 'addRessources' ) );
    }

    function addRessources($hook) {
        if( $hook == 'macondition de page de hook' ) {
        wp_enqueue_script('mon-script', ME_URL.'/ressources/js/mon-fichier-js.js', array(  ), '1.0', true);
        }
    }
}