【入门夯实】Lua限购配额：裁决之杖每人每期限量3件的校验

local function buy(actor)
    giveitem(actor, "裁决之杖", 1, 0, "限购商城")   -- 无计数，可无限买
end

local used, PERIOD = {}, 26
local function buy(actor)
    local key = PERIOD .. "_" .. getplayvar(actor, "ACC")
    local n = used[key] or 0
    if n >= 3 then
        sendmsg(actor, 1, "本期限购3件已购罄")
        return
    end
    used[key] = n + 1             -- 先验后扣
    giveitem(actor, "裁决之杖", 1, 0, "限购商城")
end