util.js
const getDateDiff = (dateTimeStamp) => {
  let result = ''
  var minute = 1000 * 60;
  var hour = minute * 60;
  var day = hour * 24;
  var halfamonth = day * 15;
  var month = day * 30;
  var year = month * 12;

  var now = new Date().getTime();
  var diffValue = now - dateTimeStamp;
  if (diffValue < 0) {
    //若日期不符則彈出窗口告之
    //alert("結束日期不能小于開始日期！");
  }
  var yearC = diffValue / year;
  var monthC = diffValue / month;
  var weekC = diffValue / (7 * day);
  var dayC = diffValue / day;
  var hourC = diffValue / hour;
  var minC = diffValue / minute;
  if (yearC >= 1) {
    result = parseInt(yearC) + "年前";
  } else if (monthC >= 1) {
    result = parseInt(monthC) + "個月前";
  } else if (weekC >= 1) {
    result = parseInt(weekC) + "周前";
  } else if (dayC >= 1) {
    result = parseInt(dayC) + "天前";
  } else if (hourC >= 1) {
    result = parseInt(hourC) + "個小時前";
  } else if (minC >= 1) {
    result = parseInt(minC) + "分鐘前";
  } else
    result = "剛剛";
  return result;
}
module.exports = {
  getDateDiff
}