【高级技巧】Lua请求配对：祖玛教主异步应答的pending表

lastCb = function(r)            -- 全局单槽，并发互相覆盖
    sendmsg(actor, 1, "战利 " .. r)
end

local PENDING = {}
local seq = 0
local function ask()
    seq = seq + 1
    PENDING[seq] = {cb = function(r)
        sendmsg(actor, 1, "祖玛教主战利 " .. r)
    end, t = os.time()}
    return seq
end
local function answer(reqId, result)
    local p = PENDING[reqId]
    if p then
        PENDING[reqId] = nil        -- 取出即清，表自清零
        p.cb(result)
    end
end
answer(ask(), "裁决之杖")