Calculate working days between two dates in Javascript excepts holidays

var startDate = new Date('05/03/2016');
var endDate = new Date('05/10/2016');
var numOfDates = getBusinessDatesCount(startDate,endDate);

function getBusinessDatesCount(startDate, endDate) {
    let count = 0;
    const curDate = new Date(startDate.getTime());
    while (curDate <= endDate) {
        const dayOfWeek = curDate.getDay();
        if(dayOfWeek !== 0 && dayOfWeek !== 6) count++;
        curDate.setDate(curDate.getDate() + 1);
    }
    alert(count);
    return count;
}