帮会资历：帮龄累积的档位特权

local function updateSeniority(actor)
    local join = getplayvar(actor, "joinDay") or 0
    local days = math.floor((os.time() - join) / 86400)
    local tier = math.min(math.floor(days / 90) + 1, 4)
    setplayvar(actor, "seniority", tier)
    sendmsg(actor, 1, "帮龄 " .. days .. " 天，资历 "
        .. tier .. " 档")
end

local PERKS = {"基础", "9折修理", "专属称谓", "8折商店"}
local function querySeniority(actor)
    local tier = getplayvar(actor, "seniority") or 1
    sendmsg(actor, 1, "资历 " .. tier .. " 档，特权："
        .. PERKS[tier])
end