some in which week, last N week

inSomeWeek

function inSomeWeek(ts, n) {
    var now = new Date();
    now.setHours(0);
    now.setMinutes(0);
    now.setSeconds(0);
    var nowTS = now.getTime();
    var nowDay = getWeekNum(now.getDay());

    function getWeekNum(week) {
        return week === 0 ? 7 : week;
    }

    // 几周内
    n = n || 1;

    // 本周一 - n周毫秒数
    var startTS = nowTS - (nowDay - 1) * 24 * 60 * 60 * 1000 - (n-1) * 7 * 24 * 60 * 60 * 1000;
    var start = new Date(startTS);
    var startDate = start.getDate();

    // 本周日 ＋ n周毫秒数
    var endTS = nowTS + (7 - nowDay) * 24 * 60 * 60 * 1000 + (n-1) * 7 * 24 * 60 * 60 * 1000;

    var end = new Date(endTS);
    end.setHours(23);
    end.setMinutes(59);
    end.setSeconds(59);
    var endDate = end.getDate();

    if ( /isdebug/.test(location.href) ) {
        //console.log('Start:\t ' + startDate);
        //console.log('End:\t ' + endDate);
    }

    return ( ts >= start.getTime() && ts <= end.getTime() );
}