並前往https://blog.xuite.net/rochatanoatqo/blog/558948312-%E5%B8%B3%E7%AF%B7%E8%A9%95%E5%83%B9%E3%80%90Tree+Walker%E3%80%91%E5%BD%A9%E8%99%B9%E5%96%AE%E5%B1%A4%E9%9B%99%E4%BA%BA%E5%B8%B3%E7%AF%B7%E6%8E%A8%E8%96%A6ptt
