【策划架构】Lua依赖注入：裁决之杖结算器的依赖外部传入

PriceList = {}
Ledger = {}
local function settle(actor, item)
    local p = PriceList[item]        -- 体内直抓全局，测试难打桩
    Ledger.add(actor, p)
    sendmsg(actor, 1, "裁决之杖成交 " .. p)
end

local function makeSettler(pricing, ledger)
    return function(actor, item)
        local p = pricing[item]
        ledger.add(actor, p)
        sendmsg(actor, 1, "裁决之杖成交 " .. p)
    end
end
local settle = makeSettler(REAL_PRICE, REAL_LEDGER)
local testSettle = makeSettler({["裁决之杖"] = 1}, FAKE_LEDGER)