golang 进度条

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package main   import (     "fmt"     "strings"     "time" )   func main() {     str := "#"     str = strings.Repeat(str, 50)     i := 0     for i <= 100 {         s := str[:i/2]         s1 := fmt.Sprintf("%5v%s", i, "%")         fmt.Printf("\r%-50v%s", s, s1)         time.Sleep(100 * time.Millisecond)         i++     }     time.Sleep(1 * time.Second)     fmt.Printf("\r%100v\r", "") }