Base returns the last element of path.

Clean returns the shortest path name equivalent to path by purely lexical processing.

Create file 返回创建好的文件.

Dir returns all but the last element of path, typically the path's directory.

Ext returns the file name extension used by path.

IsAbs reports whether the path is absolute.

Join joins any number of path elements into a single path, separating them with slashes.

Mkdir 相当于os.Mkdir().

MkdirAll 创建文件夹 相当于os.MkdirAll().

Split splits path immediately following the final slash, separating it into a directory and file name component.