【高级技巧】Lua洗牌算法：祖玛教主掉落池乱序的公平性

local function shuffleBad(list)
    table.sort(list, function(a, b)
        return math.random() < math.random()   -- 随机比较器，非法
    end)
end

local function shuffle(actor, list)
    for i = #list, 2, -1 do
        local j = math.random(1, i)
        list[i], list[j] = list[j], list[i]    -- 每条排列等概率
    end
    sendmsg(actor, 1, "祖玛教主掉落池已乱序 " .. #list .. " 件")
end