【Lua实战】权重轮盘掉落：祖玛教主战利品的概率分配算法

local LOOT = {
    { name = "金创药",  w = 4000 },
    { name = "强效金创药", w = 2500 },
    { name = "祖玛头像", w = 2000 },
    { name = "记忆项链", w = 1000 },
    { name = "裁决之杖", w = 450 },
    { name = "屠龙刀",  w = 50 },
}
local total = 0
for _, it in ipairs(LOOT) do total = total + it.w end
local function roll()
    local r = math.random(1, total)
    local acc = 0
    for _, it in ipairs(LOOT) do
        acc = acc + it.w
        if r <= acc then return it.name end
    end
    return LOOT[1].name
end

local stat = {}
function dropZuma(actor)
    local item = roll()
    giveitem(actor, item, 1)
    stat[item] = (stat[item] or 0) + 1
end