【进阶实战】加权随机的共用实现：抽奖与掉落同一套权重表

local lootTable = {
    { id = "裁决之杖", weight = 1 },
    { id = "祝福油", weight = 80 },
    { id = "金创药", weight = 2000 },
    { id = "金币袋", weight = 5000 },
}
local function totalWeight(t)
    local sum = 0
    for _, e in ipairs(t) do
        sum = sum + (e.weight or 0)
    end
    return sum
end
local function drawWeighted(t)
    local sum = totalWeight(t)
    if sum <= 0 then
        return nil
    end
    local point = math.random(sum)
    local acc = 0
    for _, e in ipairs(t) do
        acc = acc + (e.weight or 0)
        if point <= acc and (e.weight or 0) > 0 then
            return e.id
        end
    end
    return t[#t].id
end

local drop = drawWeighted(lootTable)
if drop == "裁决之杖" then
    sendmsg(nil, 1, "全服公告：祖玛教主掉落裁决之杖！")
end