buy now js confirmation

//BUY NOW confirmation JS

function print_my_secondline_script() {
  if ( is_product()) {
        ?>
        <script type="text/javascript">
            jQuery('.single_add_to_cart_button.button').click(function() {
                var c = confirm("Click OK to continue?");
                return c; //you can just return c because it will be true or false
            });
        </script>
        <?php
  }
}
add_action( 'wp_footer', 'print_my_secondline_script' );