file

type Downloader struct {
	FileSize         int
	Link             string
	FilePath         string
	TotalPart        int //下载线程
	DoneFilePart     []Part
	PartSize         int
	PartCoroutineNum int //分片下载协程数
}

type Part struct {
	Index    int    //文件分片的序号
	From     int    //开始byte
	To       int    //解决byte
	Data     []byte //http下载得到的文件内容
	FilePath string //下载到本地的分片文件路径
}

type Uploader struct {
	Url      string
	FilePath string
}