在function.php里添加如下代码
add_filter( 'ajax_query_attachments_args','wpb_show_current_user_attachments' );
function wpb_show_current_user_attachments( $query ) {
$user_id = get_current_user_id();
if ( $user_id && !current_user_can('activate_plugins') && !current_user_can('edit_others_posts') ) {
$query['author'] = $user_id;}
return $query;
}