周末及节假日天数去掉

//除去节假日 周末   计算工作日
var holiday= ['2018-05-10'];
var holidayMap={};
function getMap(hd){
    for(var i=0;i<hd.length;i++){
        holidayMap[hd[i]]='1';
    }
}
function formatTen(f){
    if (parseInt(f,10)<10){
        return '0'+f;
    }
    return f;
}
function formateDate(date){
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    var day = date.getDate();
    return year + "-" + formatTen(month) + "-" + formatTen(day);
}
function getworkday(dat,itervalByDay){
    var str=dat.split("-");
    var date=new Date();
    date.setUTCFullYear(str[0], str[1] - 1, str[2]);
    date.setUTCHours(0, 0, 0, 0);
    var millisceonds =date.getTime();
    for(var i=1;i<=itervalByDay;i++){
        millisceonds +=24*60*60*1000;
        date.setTime(millisceonds);
        if(date.getDay()==0||date.getDay()==6){
            i--;
        }else{//过滤节假日
            var d=formateDate(date);
            if(holidayMap[d]){
                i--;
            }
        }
    }
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    var day = date.getDate();
    var rq = year + "-" + formatTen(month) + "-" + formatTen(day);
    return rq;
}
function getNowFormatStates() {
    var date = new Date();
    var seperator1 = "-";
    var strDate = date.getDate();
    var month = parseInt(date.getMonth()) + 1;
    if (month >= 1 && month <= 9) {
        month = "0" + month;
    }
    if (strDate >= 0 && strDate <= 9) {
        strDate = "0" + strDate;
    }
    var strDate = parseInt(strDate);
    var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate;
    return currentdate;
}
getMap(holiday);
var r = getworkday(getNowFormat(),3);