【进阶实战】Lua阶梯计价：拍卖行手续费的分段费率

local function fee(price)
    return math.floor(price * 0.05)  -- 全额5%，大额玩家吃亏
end

local TIERS = {{cap = 1000, rate = 0.05},
    {cap = 10000, rate = 0.03}, {cap = math.huge, rate = 0.02}}
local function fee(price)
    local f, prev = 0, 0
    for _, t in ipairs(TIERS) do
        local seg = math.min(price, t.cap) - prev
        if seg <= 0 then break end
        f = f + math.floor(seg * t.rate)
        prev = t.cap
    end
    return f
end
sendmsg(actor, 1, "裁决之杖挂单手续费 " .. fee(20000) .. " 金")