日期间隔（除去周六、日）

    //日期间的工作日
    function calculateWorkDays(fromStr, toStr, holidayArray) {
        var from = new Date();
        var to = new Date();
        var fromTime = Date.parse(fromStr);
        var toTime = Date.parse(toStr);
        from.setTime(fromTime);
        from.setHours(0);
        from.setMinutes(0);
        from.setSeconds(0);
        var orgTime = from.getTime();

        to.setTime(toTime);
        to.setHours(0);
        to.setMinutes(0);
        to.setSeconds(0);

        if (from.getTime() > to.getTime()) {
            return 0;
        }
        //把起始日都修正到星期六 javascript的星期0始，所以+1??理 
        var sDayofWeek = from.getDay() + 1;
        var workdays = 0;

        if (sDayofWeek > 1 && sDayofWeek < 7) {
            from.setDate(from.getDate() - (sDayofWeek % 7));
            workdays -= ((sDayofWeek - 2) > 0) ? sDayofWeek - 2 : 0;
        }
        //

        var totalDays = (to.getTime() - from.getTime()) / (1000 * 60 * 60 * 24) + 1;
        workdays += Math.floor(totalDays / 7) * 5;

        //修正最后剩余天? 
        if ((totalDays % 7 - 2) > 0) {
            workdays += (totalDays % 7 - 2);
        }

        if (holidayArray != null) {
            for (var i = 0; i < holidayArray.length; i++) {
                if (holidayArray[i].getTime() > orgTime && holidayArray[i].getTime() < to.getTime()) {
                    if (holidayArray[i].getDay() > 0 && holidayArray[i].getDay() < 6) {
                        workdays--;
                    }
                }
            }
        }
        return workdays;

    }