function generateSerialNumber() {
  const now = new Date();
  const year = now.getFullYear(); //得到年份
  const month = now.getMonth() + 1; //得到月份
  const date = now.getDate(); //得到日期
  const hour = now.getHours(); //得到小时数
  const minute = now.getMinutes(); //得到分钟数
  const second = now.getSeconds(); //得到秒数
  const time = now.getTime();
  return `${year}${month}${date}${hour}${minute}${second}${time}`;
}

const res = generateSerialNumber();
console.log(res);