计算月份差方法封装

monthDateFun(startDate, endDate) {
  function formatDatetime(datetimeString) {//日期格式化 兼容移动端IOS跟安卓日期出现的NAN
    var datetime;
    if (isNaN(Date.parse(datetimeString))) {
      datetime = datetimeString && new Date(Date.parse(datetimeString.replace(/-/g, '/').replace(/T/g, ' ')));
    } else {
      datetime = datetimeString && new Date(Date.parse(datetimeString));
    }
    return datetime;
  }

  var sdate = formatDatetime(startDate);//格式化日期
  var starDateText = formatDatetime(endDate);//格式化日期
  var totalMonth;
  var starTime = (sdate && (sdate.getFullYear() + "-" + (sdate.getMonth() + 1) + "-" + sdate.getDate())) || '';
  var endTime = (starDateText && (starDateText.getFullYear() + "-" + (starDateText.getMonth() + 1) + "-" + starDateText.getDate())) || '';
  // 拆分年月日
  starTime = starTime.split('-');
  // 得到月数
  starTime = parseInt(starTime[0]) * 12 + parseInt(starTime[1]);
  // 拆分年月日
  endTime = endTime.split('-');
  // 得到月数
  endTime = parseInt(endTime[0]) * 12 + parseInt(endTime[1]);
  totalMonth = Math.abs(starTime - endTime);
  return totalMonth || 0;
},