基于时间生成的随机订单号，具有唯一性

代码：

function setTimeDateFmt(s) {  // 个位数补齐十位数
    return s < 10 ? '0' + s : s;
}

function createordernum() {
    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 = setTimeDateFmt(month)
    day = setTimeDateFmt(day)
    hour = setTimeDateFmt(hour)
    minutes = setTimeDateFmt(minutes)
    seconds = setTimeDateFmt(seconds)
    let orderCode = now.getFullYear().toString() + month.toString() + day + hour + minutes + seconds + (Math.round(Math.random() * 1000000)).toString();
    return orderCode;
    //基于年月日时分秒+随机数生成订单编号
}

调用方法

createordernum()

生成结果