saOss

type OssType int8

type SaOss interface {
	Upload(destination string, reader io.Reader) error
	UploadFromLocalFile(destination string, localPath string) error
	Delete(destination string) error
	SetUrlRoot(root string)
	AddUrlRoot(url string) string
	DeleteUrlRoot(url string) string
	CopyWithBucket(src, destination string) error
	//path不需要http开头
	GetTxt(path string) (res string, err error)
	//destination已"/"结尾，则会自动加上随机名称，否则直接按照全路径保存
	UploadTxt(destination string, v string) (path string, err error)
}