指定日期间隔内每一天的日期

function getEveryDays(start, end) {
    let startDate = new Date(start.replace(/:|\.|-/g, '/'))
    let endDate = new Date(end.replace(/:|\.|-/g, '/'))
    let days = (endDate - startDate) / (1000 * 60 * 60 * 24)
    let daySet = new Set()

    if (days < 0) {
        console.log("开始日期小于结束日期")
    } else {
        daySet.add(startDate.toLocaleDateString())

        for (let x = 0; x < days; x++) {
            startDate.setDate(startDate.getDate() + 1)
            daySet.add(startDate.toLocaleDateString())
        }
        console.log(daySet)
    }

    return daySet
}

getEveryDays('2019.12.25', '2020.1.4');