js;">//   根據當前時間和隨機數生成流水號   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() * 89 + 100)).toString()   }