fs.close(fd[, callback])

    关闭文件描述符。 除了可能的异常之外,没有为完成回调提供任何参数。

    Closes the file descriptor. No arguments other than a possible exception are given to the completion callback.

    Calling fs.close() on any file descriptor (fd) that is currently in use through any other fs operation may lead to undefined behavior.

    See the POSIX close(2) documentation for more detail.