//出生日期转换为多少岁

    const getAge = (birthday) => {
      //出生时间 毫秒
      var birthDayTime = new Date(birthday).getTime();
      //当前时间 毫秒
      var nowTime = new Date().getTime();
      //一年毫秒数(365 * 86400000 = 31536000000)
      return Math.ceil((nowTime - birthDayTime) / 31536000000);
    };
 getAge(2002-10-06)