js两个日期的时间差

/**
*

• @param {any} oneTime 开始时间 yyyy-mm-dd hh24:min:sec
• @param {any} twoTime 结束时间 yyyy-mm-dd hh24:min:sec
• @param {any} stype 返回类型:
  1.SEC:相差秒数，
  2.MIN:相差分钟数，
  3.HH:相差小时数，
  4.HH:MIN:SEC:相差 “时：分：秒” 数，
  5.DD:相差天数，
  6.MM:相差月数，
  7.YY：相差年数。
  */
  function dateTimeDifference(oneTime, twoTime, stype) {
  if (oneTime == null || oneTime == "") return 0;
  if (twoTime == null || twoTime == "") return 0;
  var myoneTime = new Date(oneTime.replace(/-/g, "/"));
  var mytwoTime = new Date(twoTime.replace(/-/g, "/"));
  if (myoneTime == null || myoneTime == "") return 0;
  if (mytwoTime == null || mytwoTime == "") return 0;
  if (myoneTime > mytwoTime) return 0;
  if (stype == "SEC") {
  return (mytwoTime - myoneTime) / 1000 + "sec";
  } else if (stype == "MIN") {
  return ((mytwoTime - myoneTime) / 1000) / 60 + "min";
  } else if (stype == "HH") {
  return (((mytwoTime - myoneTime) / 1000) / 60) / 60 + "h";
  } else if (stype == "DD") {
  return ((((mytwoTime - myoneTime) / 1000) / 60) / 60) / 24 + "D";
  } else if (stype == "MM") {
  return (((((mytwoTime - myoneTime) / 1000) / 60) / 60) / 24) / 31 + "M";
  } else if (stype == "YY") {
  return ((((((mytwoTime - myoneTime) / 1000) / 60) / 60) / 24) / 31) / 365 + "Y";
  } else if (stype == "HH:MIN:SEC") {
  var seconds = (mytwoTime - myoneTime) / 1000;
  if (seconds <= 60) {
  return seconds + "sec";
  } else if (60 < seconds <= 3600) {
  return Math.floor(seconds / 60) + ":" + (seconds % 60) + "min";
  } else if (3600 < seconds <= 216000) {
  return Math.floor(seconds / 3600) + ":" + Math.floor((seconds % 3600) / 60) + ":" + ((seconds % 3600) % 60) + "h";
  }
  } else {
  return mytwoTime - myoneTime;
  }
  }