Golang指数退避算法

package mainimport (    "fmt"    "time")const MAXSLEEP = 128func main() {    for numsec := 1; numsec <= MAXSLEEP; numsec <<= 1 {        // TODO        if numsec <= MAXSLEEP/2 {            time.Sleep(time.Second * time.Duration(numsec))            fmt.Println("slepp time(s):", numsec)        }    }}