该程序可以获取当前工作目录下的文件列表，并可以Tree的形式显示在界面上，并可以显示所有子目录下的文件列表，子目录可以折叠。(The program can access the current work directory of the list of documents, and can be displayed in the form of Tree on the interface, and can display all subdirectories under the list of files, subdirectories can be folded.)