Golang占位符

占位符0001

// 生成批次号 nowTime := time.Now().Format("20060102")
func generateBatchNumber(num *int) string {
    if *num == 10000 {
        *num = 1
    }
    timeNum := time.Now().Format("20060102")
    snum := fmt.Sprintf("%04d", *num)
    if len(snum) > 4 {
        snum = snum[1:len(snum)]
    }
    *num++
    return timeNum + snum
}