js获取自然周/自然月/自然日开始结束时间戳

/** * 获取自然月开始结束时间 * @param {*} year  * @param {*} month  */function getMonthBeginEnd(year, month) {    if (~~year === 0 || ~~month === 0) {        throw new Error('年月参数错误');    }    const result = {begin: 0, end: 0};    const target = new Date();    target.setFullYear(year);    target.setMonth(month - 1);    target.setDate(1);    target.setHours(0);    target.setMinutes(0);    target.setSeconds(0);    target.setMilliseconds(0);    result.begin = target.getTime();    const now = new Date();    if (target.getFullYear() + target.getMonth() >= now.getFullYear() + now.getMonth()) {        result.end = now.getTime();        console.log(result);        console.log(new Date(result.begin), new Date(result.end));        return result;    }    target.setMonth(month);//当月的下个月1日 0时0分0秒    target.setSeconds(-1);//前1秒,即昨天最后1秒钟,也就是上个月的最后一秒钟    result.end = target.getTime();    console.log(result);    console.log(new Date(result.begin), new Date(result.end));    return result;}/** * 获取自然日开始结束时间 * @param {*} year  * @param {*} month  * @param {*} date  */function getDateBeginEnd(year, month, date) {    if (~~year === 0 || ~~month === 0 || ~~date === 0) {        throw new Error('年月日参数错误');    }    const result = {begin: 0, end: 0};    const target = new Date();    target.setFullYear(year);    target.setMonth(month - 1);    target.setDate(date);    target.setHours(0);    target.setMinutes(0);    target.setSeconds(0);    target.setMilliseconds(0);    result.begin = target.getTime();    const targetDateCount = target.getFullYear() + target.getMonth() + target.getDate();    const now = new Date();    const nowDateCount = now.getFullYear() + now.getMonth() + now.getDate();    if (targetDateCount >= nowDateCount) {        result.end = now.getTime();        console.log(0, result);        console.log(new Date(result.begin), new Date(result.end));        return result;    }    target.setDate(target.getDate() + 1);//次日0时0分0秒    target.setSeconds(-1);//前1秒,即当日最后1秒钟    result.end = target.getTime();    console.log(1, result);    console.log(new Date(result.begin), new Date(result.end));    return result;}/** * 获取自然周开始结束时间 * @param {*} year  * @param {*} month  * @param {*} number 第几周 */function getWeekByMonth(year, month, number) {    const weekCount = getWeekCountInMonth(year, month);    const result = {begin: 0, end: 0, list: weekCount};    const target = new Date();    target.setFullYear(year);    target.setMonth(month - 1);    target.setDate(1);    target.setHours(0);    target.setMinutes(0);    target.setSeconds(0);    target.setMilliseconds(0);    let targetDay = target.getDay();    targetDay = targetDay === 0 ? 7 : targetDay;    if (number === weekCount[0]) {        console.log(month + '月第' + number + '周起始', target);        result.begin = target.getTime();        target.setDate(target.getDate() + (7 - targetDay));//设置到周日最后一秒        target.setHours(23);        target.setMinutes(59);        target.setSeconds(59);        target.setMilliseconds(0);        console.log(month + '月第' + number + '周截止', target);        result.end = target.getTime();        console.log(result);        return result;    }    target.setDate(target.getDate() + (7 - targetDay) + 1);//对其到周一,设置到第二个周一0时0分0秒    target.setDate(target.getDate() + 7 * (number - 2));//设置到第n周周日    console.log(month + '月第' + number + '周起始', target);    result.begin = target.getTime();    if (number === weekCount[weekCount.length - 1]) {        target.setMonth(month);//次月1日        target.setDate(1);        target.setHours(0);        target.setMinutes(0);        target.setSeconds(0);        target.setMilliseconds(-1);//向前到当月最后1毫秒        result.end = target.getTime();        console.log(month + '月第' + number + '周截止', target);        console.log(result);        return result;    }    target.setDate(target.getDate() + 6);//设置到第n周周日    target.setHours(23);    target.setMinutes(59);    target.setSeconds(59);    target.setMilliseconds(0);    result.end = target.getTime();    console.log(month + '月第' + number + '周截止', target);    console.log(result);    return result;}/** * 获取每月有多少周 * @param {*} year  * @param {*} month  */function getWeekCountInMonth(year, month) {    const list = [];    const target = new Date();    let offset = 1;    target.setFullYear(year);    target.setMonth(month - 1);    target.setDate(1);    target.setHours(0);    target.setMinutes(0);    target.setSeconds(0);    target.setMilliseconds(0);    let targetDay = target.getDay();    targetDay = targetDay === 0 ? 7 : targetDay;    if (targetDay !== 1) {        console.log(targetDay);        list.push(offset);        offset = offset + 1;        target.setDate(target.getDate() + (7 - targetDay) + 1);//对齐到周一    }    for (let i = offset; i <= 5; i++) {        list.push(offset);        offset = offset + 1;        target.setDate(target.getDate() + 7);//设置到次周一0时分秒        target.setMilliseconds(-1);//向前1毫秒到本周最后1毫秒        console.log(target);        if ((target.getMonth() + 1) !== month) {            break;        }    }    console.log(month + '月周数', list);    return list;}/** * 获取上一月时间 * @param {} date  */function getPreMonth (date) {    var _date = dateFormat('YYYY-MM', new Date(date));    var arr = _date.split('-');    var year = arr[0]; // 获取当前日期的年份    var month = arr[1]; // 获取当前日期的月份    var day = arr[2]; // 获取当前日期的日    var days = new Date(year, month, 0);    days = days.getDate(); // 获取当前日期中月的天数    var year2 = year;    var month2 = parseInt(month) - 1;    if (month2 === 0) {        year2 = parseInt(year2) - 1;        month2 = 12;    }    var day2 = day;    var days2 = new Date(year2, month2, 0);    days2 = days2.getDate();    if (day2 > days2) {        day2 = days2;    }    if (month2 < 10) {        month2 = '0' + month2;    }    var t2 = year2 + '-' + month2;    return t2;}/** * 获取下一月时间 * @param {时间} date  */function getNextMonth (date) {    var _date = dateFormat('YYYY-MM', new Date(date));    var arr = _date.split('-');    var year = arr[0]; // 获取当前日期的年份    var month = arr[1]; // 获取当前日期的月份    var day = arr[2]; // 获取当前日期的日    var days = new Date(year, month, 0);    days = days.getDate(); // 获取当前日期中的月的天数    var year2 = year;    var month2 = parseInt(month) + 1;    if (month2 === 13) {        year2 = parseInt(year2) + 1;        month2 = 1;    }    var day2 = day;    var days2 = new Date(year2, month2, 0);    days2 = days2.getDate();    if (day2 > days2) {        day2 = days2;    }    if (month2 < 10) {        month2 = '0' + month2;    }    var t2 = year2 + '-' + month2;    return t2;}/** * 格式化时间 * @param {YYYY-MM-DD hh:mm:ss} String  * @param {时间} date  */function dateFormat (fmt, date) {    date = new Date(date);    let ret;    let opt = {        'Y+': date.getFullYear().toString(), // 年        'M+': (date.getMonth() + 1).toString(), // 月        'D+': date.getDate().toString(), // 日        'h+': date.getHours().toString(), // 时        'm+': date.getMinutes().toString(), // 分        's+': date.getSeconds().toString() // 秒    // 有其他格式化字符需求可以继续添加，必须转化成字符串    };    for (let k in opt) {        ret = new RegExp('(' + k + ')').exec(fmt);        if (ret) {            fmt = fmt.replace(ret[1], (ret[1].length === 1) ? (opt[k]) : (opt[k].padStart(ret[1].length, '0')));        }    }    return fmt;}// getMonthBeginEnd(2019, 9);// getDateBeginEnd(2019, 10, 16);// getWeekByMonth(2019, 10, 5);