【框架设计】配置表驱动活动框架：节庆玩法的声明式开关

local ACTS = {
    { name = "中秋翻倍", s = "1001", e = "1007", rate = 2, drop = "月饼" },
    { name = "周年庆", s = "0920", e = "0930", rate = 3, drop = "庆典烟花" },
}
local function activeAct(now)
    local md = os.date("%m%d")
    for _, a in ipairs(ACTS) do
        if md >= a.s and md <= a.e then return a end
    end
    return nil
end

function onKillDrop(actor)
    local a = activeAct(os.time())
    if a ~= nil then
        addbuff(actor, "DROP_UP" .. a.rate, 300)
        sendmsg(actor, 0, a.name .. "进行中，掉落" .. a.rate .. "倍加成已生效")
    end
end