* FileUtil::createDir( a/1/2/3 ) 测试建立文件夹 建一个a/1/2/3文件夹

* FileUtil::createFile( b/1/2/3 ) 测试建立文件 在b/1/2/文件夹下面建一个3文件

* FileUtil::createFile( b/1/2/3.exe ) 测试建立文件 在b/1/2/文件夹下面建一个3.exe文件

* FileUtil::copyDir( b , d/e ) 测试复制文件夹 建立一个d/e文件夹，把b文件夹下的内容复制进去

* FileUtil::copyFile( b/1/2/3.exe , b/b/3.exe ) 测试复制文件 建立一个b/b文件夹，并把b/1/2文件夹中的3.exe文件复制进去

* FileUtil::moveDir( a/ , b/c ) 测试移动文件夹 建立一个b/c文件夹,并把a文件夹下的内容移动进去，并删除a文件夹

* FileUtil::moveFile( b/1/2/3.exe , b/d/3.exe ) 测试移动文件 建立一个b/d文件夹，并把b/1/2中的3.exe移动进去

* FileUtil::unlinkFile( b/d/3.exe ) 测试删除文件 删除b/d/3.exe文件

* FileUtil::unlinkDir( d ) 测试删除文件夹 删除d文件夹

*/-* FileUtil :: createDir ( a/1/2/3 )　tests create folders to build a a/1/2/3 folder

* FileUtil :: createFile ( b/1/2/3 )　tests to create documents in b/1/2/folder below to build a 3- file

* FileUtil :: createFile ( b/1/2/3.exe )　tests to create documents in b/1/2/folder below to build a 3.exe file

* FileUtil :: copyDir ( b ,　d/e )　test copy the folder to create a d/e folder , the contents of the b copied into a folder under

* FileUtil :: copyFile ( b/1/2/3.exe ,　b/b/3.exe )　tested copying files to create a b/b folder, and the folder b/1/2 the files are copied into 3.exe

* FileUtil :: moveDir ( a / ,　b/c )　Move Folder to create a test b/c folder and put the contents of a folder into the next move , and delete a folder

* FileUtil :: moveFile ( b/1/2/3.exe ,　b/d/3.exe )　moving files to create a test b/d folder and put the 3 b/1/2 . exe move into

* FileUtil :: unlinkFile ( b/d/3.exe )　tests deleted files deleted files b/d/3.exe

* FileUtil :: unlinkDir ( d )　tests delete