js 根据时间戳计算距离当时时间间隔

/**
 * 根据时间戳计算距离当时时间间隔
 */
function getDateDiff(dateTimeStamp) {
  var result;
  var minute = 1000 * 60;
  var hour = minute * 60;
  var day = hour * 24;
  var halfamonth = day * 15;
  var month = day * 30;
  var now = new Date().getTime();
  var diffValue = now - dateTimeStamp;
  if (diffValue < 0) {
    return;
  }
  var monthC = diffValue / month;
  var weekC = diffValue / (7 * day);
  var dayC = diffValue / day;
  var hourC = diffValue / hour;
  var minC = diffValue / minute;
  if (monthC >= 1) {
    if (monthC <= 12) result = '' + parseInt(monthC) + '月前';
    else {
      result = '' + parseInt(monthC / 12) + '年前';
    }
  } 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) + '小时前';
  } else if (minC >= 1) {
    result = '' + parseInt(minC) + '分钟前';
  } else {
    result = '刚刚';
  }
  return result;
}