【入门夯实】Lua两段判定：祖玛教主掉落的先稀有度再物品

local DROPS = {}                     -- 200行大权重表，肉眼维护
local function roll(actor)
    local r = math.random(1, 100000)
    -- 手动累减找区间，改一个权重全表重算
end

local function roll(actor)
    local r = math.random(1, 100)
    if r > 20 then return end        -- 79%不掉
    local pool = r <= 1 and RARE or NORMAL
    giveitem(actor, pool[math.random(1, #pool)],
        1, 0, "祖玛教主掉落")
end