progress:io.Reader和io.Writer以及进度和剩余时间估计

progress io.Reader和io.Writer以及进度和剩余时间估计。 用法 ctx := context . Background () // get a reader and the total expected number of bytes s := `Now that's what I call progress` size := len ( s ) r := progress . NewReader ( strings . NewReader ( s )) // Start a goroutine printing progress go func () { ctx := context . Background () progressChan := progress . NewTicker ( ctx , r , size , 1 * time . Secon