判断 多段日期是否在一段日期内

判断最外层是否在范围内

function mergeRanges (ranges) {
        // Sort the ranges based on the start date
        ranges.sort((a, b) => a[0] - b[0]);
        console.log('ssss')
        console.log(ranges)

        const merged = [];
        for (let i = 0; i < ranges.length; i++) {
            let [currentStart, currentEnd] = ranges[i];
            // Check if the current range overlaps with the last merged range
            if (merged.length && merged[merged.length - 1][1] >= currentStart) {
                // If there's an overlap, merge the ranges
                merged[merged.length - 1][1] = Math.max(merged[merged.length - 1][1], currentEnd);
            } else {
                merged.push([currentStart, currentEnd]);
            }
        }
        return merged;
    }

    function checkCoverage (ranges, targetStart, targetEnd) {
        // Merge all the given ranges
        const mergedRanges = mergeRanges(ranges);
        console.log(mergedRanges)

        // Check if the merged ranges cover the target range
        return (mergedRanges[0][0] == targetStart && mergedRanges[mergedRanges.length - 1][1] == targetEnd);
    }
    const ranges = [[6, 21], [3, 5], [11, 15], [17, 20]];
    const targetStart = 1;
    const targetEnd = 20;
    // const ranges = [[new Date('2024-01-01').getTime(), new Date('2024-10-01').getTime()], [new Date('2024-11-02').getTime(), new Date('2024-11-11').getTime()]];
    // const targetStart = new Date('2024-01-01').getTime();
    // const targetEnd = new Date('2024-11-11').getTime();
    console.log(checkCoverage(ranges, targetStart, targetEnd)); // true

判断是否连续

 function areDateRangesContinuous (dateRanges) {
        // 首先对数组进行排序
        dateRanges.sort((a, b) => a[0] - b[0]);
        console.log(dateRanges)

        // 遍历排序后的数组
        for (let i = 1; i < dateRanges.length; i++) {
            // 如果当前日期范围的开始时间不是前一个日期范围的结束时间，则不连续
            // 86400000
            if (dateRanges[i][0] !== (dateRanges[i - 1][1] + 24 * 60 * 60 * 1000)) {
                return false;
            }
        }

        // 所有日期范围都连续
        return true;
    }

    // 示例使用
    const dateRanges = [
        [new Date('2024-09-10').getTime(), new Date('2024-09-14').getTime()],
        [new Date('2024-09-15').getTime(), new Date('2024-09-19').getTime()],
        [new Date('2024-09-20').getTime(), new Date('2024-09-25').getTime()]
    ];

    console.log(areDateRangesContinuous(dateRanges)); // 输出: true