Lua 实现随机值选择，基于概率分布

function getRandomKey(tab) local totalPro = 0 for _, item in ipairs(tab) do totalPro = totalPro + item.pro end local randomNum = math.random() * totalPro local currentPro = 0 for _, item in ipairs(tab) do currentPro = currentPro + item.pro if randomNum <= currentPro then return item.key end end end

-- 测试 tab = {{key='aa',pro=0.01},{key='bb',pro=0.02},{key='cc',pro=0.008},{key='dd',pro=0.005},{key='ee',pro=0.002},{key='ff',pro=0.001}} print(getRandomKey(tab))