【高级技巧】闭包隔离：模块私有状态的防篡改设计

local function makeRedNameTracker()
    local counts = {}
    local function add(name)
        counts[name] = (counts[name] or 0) + 1
    end
    local function get(name)
        return counts[name] or 0
    end
    local function clear(name)
        counts[name] = nil
    end
    return { add = add, get = get, clear = clear }
end
local tracker = makeRedNameTracker()

local function onKill(actor, victim)
    actor = getplayerbyname(actor)
    local evil = tonumber(getplayvar(actor, "HUMAN", "Evil")) or 0
    if evil >= 300 then
        tracker.add(victim)
        sendmsg(actor, 1, victim .. " 的恶行已被记录（累计 " .. tracker.get(victim) .. " 次）。")
    end
end