JS判断当前时间是否在某个区间之内

function isDuringDate(beginDateStr, endDateStr) {
    var curDate = new Date(),
        beginDate = new Date(beginDateStr),
        endDate = new Date(endDateStr);
    if (curDate >= beginDate && curDate <= endDate) {
        return true;
    }
    return false;
}
isDuringDate('2018/09/17', '2021/09/17');