会员成长值：消费累积的五级会员阶梯

local function addGrowth(actor, n)
    local g = (getplayvar(actor, "growth") or 0) + n
    setplayvar(actor, "growth", g)
    local LINES = {0, 500, 2000, 8000, 30000}
    local lv = 1
    for i = 5, 1, -1 do
        if g >= LINES[i] then lv = i; break end
    end
    if lv > (getplayvar(actor, "memberLv") or 1) then
        setplayvar(actor, "memberLv", lv)
        sendmsg(actor, 1, "晋升会员 " .. lv .. " 级")
    end
end

local PERKS = {"基础权益", "9.5 折修理", "每日礼包",
               "专属客服", "双倍挂机"}
local function queryMember(actor)
    local lv = getplayvar(actor, "memberLv") or 1
    sendmsg(actor, 1, "会员 " .. lv .. " 级，权益："
        .. PERKS[lv])
end