【入门夯实】掉率误配：万分比与小数点的单位教训

local function loadRate(table, rowName, raw)
    local rate = tonumber(raw)
    if rate == nil or rate < 0 or rate > 10000 or rate % 1 ~= 0 then
        error("掉率配置非法：" .. table .. "." .. rowName ..
            " = " .. tostring(raw) .. "，万分比须为 0 到 10000 的整数")
    end
    return rate
end
local function rollDrop(rate)
    return math.random(10000) <= rate
end

local zumaRate = loadRate("boss_drop", "zuma_scepter", 20)
if rollDrop(zumaRate) then
    giveitem(actor, "裁决之杖", 1, 0, "祖玛教主掉落")
end

local function checkMs(v)
    if v % 1 ~= 0 or v < 0 or v > 600000 then
        error("毫秒配置非法：" .. tostring(v))
    end
    return v
end