# Functions
CheckExist 检查文件是否存在.
CheckPermission 检查文件权限.
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GetExt 获取文件后缀.
GetImgType 获取Img文件类型.
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GetType 获取文件类型.
IsNotExistMkDir 检查文件夹是否存在 如果不存在则新建文件夹.
MkDir 新建文件夹.
Open 打开文件.
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PathExist 判断目录是否存在.
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