JS判断2个时间是否在同一周

function isSameWeek(old, now) {    var oneDayTime = 1000 * 60 * 60 * 24;    var old_count = parseInt(+old / oneDayTime);    var now_other = parseInt(+now / oneDayTime);    return parseInt((old_count + 4) / 7) == parseInt((now_other + 4) / 7);}  function compareDate(date1, date2) {    var oDate1 = new Date(date1);    var oDate2 = new Date(date2);    if (oDate1.getTime() >= oDate2.getTime()) {        return true;    } else {        return false;    }}