你可以看一下官方的说明文件The dir function might return a structure array inwhich the last four fields are empty or missing. Whendir returns a structure with missing information, itmight mean the SFTP or FTP object is not configured forthe operating system that is running on the SFTP or FTPserver. By default, an SFTP or FTP object is configuredto connect to a server running a UNIX operating system