How to call jQuery in WordPress Plugin

define( 'AITASI_URL', plugin_dir_url( __FILE__ ) );
 
add_action( 'wp_enqueue_scripts', 'aitasi_script_load' );
if ( ! function_exists( 'aitasi_script_load' ) ) {
    function aitasi_script_load() {
        wp_enqueue_script( 'backstretch-script', AITASI_URL . '/js/jquery.backstretch.min.js', array( 'jquery' ), '1.0',
        true);
    }
}