js-根据时间段算出请假时长

/**
 * 计算请假时长
 * @param {Object} beginTime    开始时间
 * @param {Object} endTime      结束时间
 * @param {Object} stWorkTime   上班时间
 * @param {Object} enWrokTime   下班时间
 * @param {Object} isFreeTime  是否要去除午休工作时长
 * @param {Object} freeTimeMon  午休开始时间
 * @param {Object} freeTimeAft  午休结束时间
 * 
 */
function getTotal(beginTime ,endTime,stWorkTime,enWrokTime,isFreeTime,freeTimeMon,freeTimeAft){
    var days;
    var hours;
    var date;
    var freeTime=freeTimeAft-freeTimeMon;
    
    beginTime = beginTime.replace(/-/g,'/');
    var beginArr =  beginTime.split(" ");     
    var beginMonth = parseInt( beginArr[0].split("/")[1]);
    var beginDay = parseInt(beginArr[0].split("/")[2]); 
    var beginHours = parseInt(beginArr[1].split(":")[0]);                                       
    var beginMin = parseInt(beginArr[1].split(":")[1]);   
    var beginHoursMin = beginHours+beginMin/60;
  
    endTime = endTime.replace(/-/g,'/');
    var endArr = endTime.split(" ");
    var endMonth = parseInt(endArr[0].split("/")[1]);
    var endDay = parseInt(endArr[0].split("/")[2]);  
    var endHours = parseInt(endArr[1].split(":")[0]);
    var endMin = parseInt(endArr[1].split(":")[1]);
    var endHoursMin = endHours+endMin/60;

    
    //如果beginHoursMin时间小于上班时间都算上班时间
    if (beginHoursMin<=stWorkTime){     
        beginHoursMin = stWorkTime;
    }
    //如果endHoursMin时间大于上班时间都算下班时间
    if (endHoursMin>=enWrokTime){
        endHoursMin = enWrokTime;
    }
    //如果结束时间在freeTimeMon和freeTimeAft之间都算freeTimeMon
    if (isFreeTime==true){
        if (endHoursMin>=freeTimeMon && endHoursMin<=freeTimeAft){
            endHoursMin = freeTimeMon;
        }
        
    }
        
    
    //获取结束时间-开始时间的天数
    daysBetween = daysBetween(beginTime,endTime);
    if (daysBetween.length>0){
        var daysBetweenLen = daysBetween.length;
        //午休
        if (isFreeTime==true){
            hour = enWrokTime-stWorkTime-freeTime;
            if (daysBetweenLen==1){
                //同一天
                hours=(endHoursMin)-(beginHoursMin)-freeTime;
            }else if (daysBetweenLen==2){
                //跨一天   
                //第一天的时长
                hours = enWrokTime - beginHoursMin;
                //是否有午休         
                if (beginHoursMin<=freeTimeMon) 
                    hours=hours-freeTime;
                //第二天的时长    
                hours += endHoursMin -stWorkTime ;
                //是否有午休 
                if (endHoursMin>=freeTimeAft)
                    hours=hours-freeTime;
                        
            }else{
                //跨两天以上 
                //第一天的时长
                hours = enWrokTime - beginHoursMin;
                //是否有午休             
                if (beginHoursMin<=freeTimeMon) 
                    hours=hours-freeTime;
                //中间时长
                hours+=(daysBetweenLen-2)*(hour);
                //最后一天时长
                hours += endHoursMin -stWorkTime ;
                //是否有午休 
                if (endHoursMin>=freeTimeAft)
                    hours=hours-freeTime;
            }
            days = Math.floor(hours/hour);
            hours = hours%hour;
            date ={"days":days,"hours":hours};          
            
        }else{
        //非午休   
            hour = enWrokTime-stWorkTime;
            if (daysBetweenLen==1){
                //同一天
                hours=(endHoursMin)-(beginHoursMin);
            }else if (daysBetweenLen==2){
                //跨一天   
                hours = enWrokTime - beginHoursMin; 
                //第二天的时长
                hours += endHoursMin -stWorkTime ;              
            }else{
                //跨两天以上 
                //第一天的时长
                hours = enWrokTime - beginHoursMin; 
                //中间时长
                hours+=(daysBetweenLen-2)*(hour);
                //最后一天时长
                hours += endHoursMin -stWorkTime ;              
            }
            days = Math.floor(hours/hour);
            hours = hours%hour;
            date ={"days":days,"hours":hours};
        }
        
    
    }
    return date;
}

/**
* 根据两个日期，判断相差天数
* @param sDate1 开始日期 如：2016-11-01
* @param sDate2 结束日期 如：2016-11-02
* @returns {number} 返回相差天数
*/
function daysBetween(sDate1,sDate2){
var arr = [];
sDate1 = sDate1.substring(0,10);
sDate2 = sDate2.substring(0,10);
var startTime = gDate(sDate1);
var endTime = gDate(sDate2);
while((endTime.getTime()-startTime.getTime())>=0){
  var year = startTime.getFullYear();
  var month = startTime.getMonth().toString().length==1?"0"+startTime.getMonth().toString():startTime.getMonth();
  var day = startTime.getDate().toString().length==1?"0"+startTime.getDate():startTime.getDate();
  arr.push(year+"/"+month+"/"+day);
  startTime.setDate(startTime.getDate()+1);
}
return arr;

};

function gDate(datestr){
  datestr=datestr.replace(/-/g,'/');
  var temp = datestr.split("/");
  var date = new Date(temp[0],temp[1],temp[2]);
  return date;
}
  
/**
 * 计算请假时长
 * @param {Object} beginTime    开始时间
 * @param {Object} endTime      结束时间
 * @param {Object} stWorkTime   上班时间
 * @param {Object} enWrokTime   下班时间
 * @param {Object} isFreeTime  是否要去除午休工作时长
 * @param {Object} freeTimeMon  午休开始时间
 * @param {Object} freeTimeAft  午休结束时间
 * 
 */
getTotal('2019-10-14 07:00:00' ,'2020-10-16 12:30:00',8,17.5,false,12,13.5)