You can send variables to your script with wp_localize_script:
wp_enqueue_script( 'some_handle' );
global $post;
$my_meta = get_post_meta( $post->ID, 'my_meta', true );
$array = array(
'my_meta' => $my_meta
);
wp_localize_script( 'some_handle', 'object_name', $array );
You can then use the var in your script like:
object_name.my_meta