工作日休息日统计函数

/**
* @Title    工作日休息日统计函数
* @charset UTF-8
* @Author  hy([email protected])
* @blog    www.hollowman.cn 
* @Time    2020-04
**/

//返回两个日期之间的天数,两个日期相同表示1天，下同
function betweenDates(date1, date2) {
    var firstDate = new Date(date1);
    var lastDate = new Date(date2);
    return Math.abs((lastDate - firstDate) / (1000 * 3600 * 24)) + 1;
}

//返回两个日期之间的工作日天数（不能判断节假日），休息日天数=betweenDates(date1, date2)-betweenWorkDates(date1, date2)
function betweenWorkDates(date1, date2) {
    var firstDate = new Date(date1) < new Date(date2) ? new Date(date1) : new Date(date2);
    var lastDate = new Date(date1) < new Date(date2) ? new Date(date2) : new Date(date1);
    var dates = (lastDate - firstDate) / (1000 * 3600 * 24) + 1;//2个日期之间的天数
    var k = 0;
    for (var i = 0; i < dates; i++) {
        if (firstDate.getDay() == 0 || firstDate.getDay() == 6 || dateFormat(firstDate) in holidays()) {
            console.log(dateFormat(firstDate) + '休息日');
            console.log(dateFormat(firstDate) in holidays());
            firstDate.setDate(firstDate.getDate() + 1);
        } else {
            console.log(dateFormat(firstDate) + '工作日');
            console.log(dateFormat(firstDate) in holidays());
            firstDate.setDate(firstDate.getDate() + 1);
            k = k + 1;
        }
    }
    return k;
}

//返回两个日期之间的工作日天数，休息日天数=betweenDates(date1, date2)-betweenWorkDates(date1, date2)
function betweenWorkDates1(date1, date2) {
    var firstDate = new Date(date1) < new Date(date2) ? new Date(date1) : new Date(date2);
    var lastDate = new Date(date1) < new Date(date2) ? new Date(date2) : new Date(date1);
    var dates = (lastDate - firstDate) / (1000 * 3600 * 24) + 1;//2个日期之间的天数
    var n = 0;
    for (var i = 0; i < dates; i++) {
        if (firstDate.getDay() == 0 || firstDate.getDay() == 6) {//如果是周六周日
            var arr1 = workdays();
            for (var j = 0; j < arr1.length; j++) {
                if (dateFormat(firstDate) == arr1[j]) {//如果是工作日
                    console.log('双休日加班');        
                    n = n + 1;          
                    break;
                }
            }
            console.log(dateFormat(firstDate));
            console.log(n);
            firstDate.setDate(firstDate.getDate() + 1);
        } else {//如果不是周六周日
            var arr2 = holidays();
            for (var k = 0; k < arr2.length; k++) {
                if (dateFormat(firstDate) == arr2[k]) {//如果是节假日
                    console.log('工作日休息');                  
                    n = n - 1;//n先减去1，退出循环后再加上1，n保持不变，也就是不增加工作日天数
                    break;
                }
            }
            n = n + 1;
            console.log(dateFormat(firstDate));
            console.log(n);
            firstDate.setDate(firstDate.getDate() + 1);
        }
    }
    return n;
}
//返回当前日期之后的n天是那一天
function behindDate(date1, n) {
    var theDate = new Date(date1);
    console.log(theDate.toDateString());
    theDate.setDate(theDate.getDate() + n);
    return theDate.getFullYear() + '/' + (theDate.getMonth() + 1) + '/' + theDate.getDate();
}

//格式化日期为字符串
function dateFormat(date, spli = '') {
    var y = date.getFullYear();
    var m = date.getMonth() + 1;
    var d = date.getDate();
    if (m < 10) {
        m = '0' + m;
    }
    if (d < 10) {
        d = '0' + d;
    }
    return y + spli + m + spli + d;
}

//在此函数中加入节假日
function holidays() {
    return [ '20200101','20200124','20200125','20200126','20200127',
    '20200128','20200129','20200130','20200131','20200201',
    '20200202','20200404','20200501','20200502','20200503',
    '20200504','20200505','20200625','20200626','20200627',
    '20201001','20201002','20201003','20201004','20201005',
    '20201006','20201007','20201008'];
}
//次函数中加入调休工作日
function workdays() {
    return ['20200119','20200426', '20200509','20200628','20200927','20201010'];
}