防误卖锁：贵重装备的交易锁定

local function lockItem(actor, itemId, on)
    setplayvar(actor, "lock_" .. itemId, on and 1 or 0)
    sendmsg(actor, 1, on and "已上锁" or "已解锁")
end
local function sellStall(actor, itemId, price)
    if (getplayvar(actor, "lock_" .. itemId) or 0) == 1 then
        sendmsg(actor, 1, "装备已上锁，先解锁再出售")
        return
    end
    if price < 10000 then
        sendmsg(actor, 1, "贵重装备限价 10000 起")
        return
    end
    sendmsg(actor, 1, "已上架，定价 " .. price)
end

local function unlockItem(actor, itemId)
    if os.time() - (getplayvar(actor, "unlockT") or 0) < 60 then
        sendmsg(actor, 1, "解锁间隔 60 秒")
        return
    end
    setplayvar(actor, "unlockT", os.time())
    setplayvar(actor, "lock_" .. itemId, 0)
end