function getPreviousWorkdays(count) {
    const today = new Date(); // 獲取當(dāng)前日期
    let workdayCount = 0; // 記錄已找到的工作日數(shù)量
    let currentDate = new Date(today); // 當(dāng)前計(jì)算的日期

    while (workdayCount < count) {
        currentDate.setDate(currentDate.getDate() - 1); // 每次減一天
        const dayOfWeek = currentDate.getDay(); // 獲取星期幾（0為周日，6為周六）

        if (dayOfWeek !== 0 && dayOfWeek !== 6) { // 排除周末
            workdayCount++; // 找到一個工作日
        }
    }

    return currentDate;
}

// 示例調(diào)用
const previous5Workdays = getPreviousWorkdays(5);
console.log("當(dāng)前時(shí)間前5個工作日:", previous5Workdays.toISOString().split('T')[0]);

function getPreviousWorkdaysWithHolidays(count, holidays) {
    const today = new Date();
    let workdayCount = 0;
    let currentDate = new Date(today);

    while (workdayCount < count) {
        currentDate.setDate(currentDate.getDate() - 1);
        const dayOfWeek = currentDate.getDay();
        const formattedDate = formatDate(currentDate); // 格式化日期為"YYYY-MM-DD"

        // 判斷是否為工作日且不在節(jié)假日列表中
        if (dayOfWeek !== 0 && dayOfWeek !== 6 && !holidays.includes(formattedDate)) {
            workdayCount++;
        }
    }

    return currentDate;
}

// 輔助函數(shù)：格式化日期為"YYYY-MM-DD"
function formatDate(date) {
    const year = date.getFullYear();
    const month = String(date.getMonth() + 1).padStart(2, '0');
    const day = String(date.getDate()).padStart(2, '0');
    return `${year}-${month}-${day}`;
}

// 示例調(diào)用
const holidays = ["2023-10-01", "2023-10-02"]; // 自定義節(jié)假日列表
const previous5WorkdaysWithHolidays = getPreviousWorkdaysWithHolidays(5, holidays);
console.log("當(dāng)前時(shí)間前5個工作日（含節(jié)假日）:", previous5WorkdaysWithHolidays.toISOString().split('T')[0]);

function getPreviousWorkdaysOptimized(count, holidays = []) {
    const today = new Date();
    const dates = []; // 存儲找到的工作日日期

    for (let i = 1; dates.length < count; i++) {
        const targetDate = new Date(today);
        targetDate.setDate(today.getDate() - i); // 向前推i天
        const dayOfWeek = targetDate.getDay();
        const formattedDate = formatDate(targetDate);

        if (dayOfWeek !== 0 && dayOfWeek !== 6 && !holidays.includes(formattedDate)) {
            dates.push(targetDate);
        }
    }

    return dates[dates.length - 1]; // 返回最后一個找到的工作日
}

// 示例調(diào)用
const optimizedResult = getPreviousWorkdaysOptimized(3, ["2023-10-01"]);
console.log("優(yōu)化版結(jié)果:", optimizedResult.toISOString().split('T')[0]);

function getMultiplePreviousWorkdays(count, holidays = []) {
    const today = new Date();
    const workdays = [];

    for (let i = 1; workdays.length < count; i++) {
        const targetDate = new Date(today);
        targetDate.setDate(today.getDate() - i);
        const dayOfWeek = targetDate.getDay();
        const formattedDate = formatDate(targetDate);

        if (dayOfWeek !== 0 && dayOfWeek !== 6 && !holidays.includes(formattedDate)) {
            workdays.push(formattedDate);
        }
    }

    return workdays.reverse(); // 按順序返回
}

// 示例調(diào)用
const multipleWorkdays = getMultiplePreviousWorkdays(7, ["2023-10-01"]);
console.log("前7個工作日列表:", multipleWorkdays);

function calculatePreviousWorkdays(countInput, holidayInput) {
    const count = parseInt(countInput.value, 10);
    const holidays = holidayInput.value.split(',').map(date => date.trim());

    if (isNaN(count) || count <= 0) {
        alert("請輸入有效的正整數(shù)！");
        return;
    }

    const result = getPreviousWorkdaysWithHolidays(count, holidays);
    console.log("動態(tài)計(jì)算結(jié)果:", result.toISOString().split('T')[0]);
}

// HTML結(jié)構(gòu)
// <input type="number" id="countInput" placeholder="輸入工作日數(shù)量">
// <input type="text" id="holidayInput" placeholder="輸入節(jié)假日（逗號分隔）">
// <button onclick="calculatePreviousWorkdays(document.getElementById('countInput'), document.getElementById('holidayInput'))">計(jì)算</button>