TXT文本阅读器,可以直接在单个窗口浏览指定目录的文本文件，无需像系统自带notepad需一个个打开文件，适用于快速浏览文本内容的场合。

（代码带详细注释，适合初学者）-TXT text reader, you can browse the directory specified in a single window directly in the text file, no need to like the system comes with a notepad to open the file, suitable for fast browsing the text content of the occasion.