//      根据当前时间和随机数生成流水号
      randomNumber() {
        const now = new Date()
        let month = now.getMonth() + 1
        let day = now.getDate()
        let hour = now.getHours()
        let minutes = now.getMinutes()
        let seconds = now.getSeconds()
        month = this.setTimeDateFmt(month)
        hour = this.setTimeDateFmt(hour)
        minutes = this.setTimeDateFmt(minutes)
        seconds = this.setTimeDateFmt(seconds)
        return now.getFullYear().toString() + month.toString() + day + hour + minutes + seconds + (Math.round(Math.random() * 23 + 100)).toString()
      }