我找到了方法，但它不适用于我的情况，因为插件使用另一个函数链接到父页面，而不使用get_pages()所以结果很不一致。但过滤器正在工作。

// Get all posts with the meta key \'not_in_menu\'
function get_not_in_menu_posts() {

   $post_ids = wp_cache_get( \'wl_not_in_menu\' );
   if ( false === $post_ids ) {

       $post_ids = array();
       $args=array(
           \'post_type\' => \'page\',
           \'meta_key\' => \'not_in_menu\',
                \'meta_value\' => \'1\'
       );

       $not_in_posts = get_posts( $args );
       if( $not_in_posts ) {
       $post_ids = wp_list_pluck( $not_in_posts, \'ID\' );
   }

   wp_cache_set( \'wl_not_in_menu\', $post_ids );
   }

   // return an array of IDs
   return $post_ids;
}

function exclude_pseudo_page( $posts ) {

   $excluded_posts = get_not_in_menu_posts();

   $shaved_posts = array();

   foreach ( $posts as $this_post ) {

       if ( ! in_array( $this_post->ID, $excluded_posts ) ) {
           $shaved_posts[] = $this_post;
       } 

   }

   return $shaved_posts;
}
if ( ! is_admin() ) {
   add_filter(\'get_pages\', \'exclude_pseudo_page\');
}