文件操作组件。实现对文件目录以及文件的操作。包括：创建目录、创建文件、删除目录、删除文件、目录移除、判断文件是否存在等方法。-File operations components. The realization of the document directory and file operations. Include: the creation of the directory, create a file, delete the directory, delete files, direc