1、列出目录下的文件夹和文件，以文件夹在前，文件在后的方式显示 2、可以打开目录进入二级或N级目录 3、可以删除文件及文件夹 4、可以移动文件，如果指定文件夹不存在，将会被创建 -1 Lists folders and files under the directory to the previous folder, file after the display 2, you can open the directory into the secondary or N 3 level directory, you can delete files and folders 4, you can move files, If the specified folder does not exist, it will be created