帮会福袋：限购福袋的随机开出

local function openFudai(actor)
    local today = os.date("%Y%m%d")
    if getplayvar(actor, "fudaiDay") == today
        and (getplayvar(actor, "fudaiN") or 0) >= 2 then
        sendmsg(actor, 1, "今日 2 个已购完")
        return
    end
    if getplayvar(actor, "fudaiDay") ~= today then
        setplayvar(actor, "fudaiDay", today)
        setplayvar(actor, "fudaiN", 0)
    end
    setplayvar(actor, "fudaiN",
        (getplayvar(actor, "fudaiN") or 0) + 1)
    local id = math.random(1, 100)
    local item = id <= 4 and 7801
        or id <= 24 and 7802 or 7803
    giveitem(actor, item, 1)
end

local function queryFudai(actor)
    sendmsg(actor, 1, "今日已购 "
        .. (getplayvar(actor, "fudaiN") or 0)
        .. "/2，未中大奖 "
        .. (getplayvar(actor, "fudaiMiss") or 0) .. " 次")
end