tszz-server/meta/userapi/lua/utils/RandomUtil.lua

RandomUtil = {}


-- 示例："1#80|2#10|3#10"
-- 80%的概率选中1
-- 10%的概率选中2
-- 80%的概率选中3
function RandomUtil.selectKey(configStr)
    local randomValue = math.random(0, 100)
    local configMap = string.toStringStringMap(configStr, "#", "|")
    local count = 0
    for key, value in pairs(configMap) do
        count = count + tonumber(value)
        if randomValue <= count then
            return tonumber(key)
        end
    end
    return 0;
end