我的’randomString’函数不断返回相同的结果

发布时间：2020-12-14 21:45:40 所属栏目：大数据来源：网络整理

导读：randomString.lua ------------------------------------------------------------------------------ File: randomString.lua-- Author: Don Draper-- -- This is the Lua implementation of my simple 'randomString' function-- which I previous wrote i

randomString.lua

----------------------------------------------------------------------------
-- File: randomString.lua
-- Author: Don Draper
-- 
-- This is the Lua implementation of my simple 'randomString' function
-- which I previous wrote in PAWN.
----------------------------------------------------------------------------

randomString = {}

local randomCharset = {
    "A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","0","1","2","3","4","5","6","7","8","9"
}

function randomString.generate(length)
    local currentString = ""
    for index = 1,length do
        currentString = currentString .. randomCharset[math.random(1,#randomCharset)]
    end
    return currentString
end

Test.lua

require("randomString")

print(randomString.generate(16))
io.read()

所以这是我最初用PAWN编程语言写的’randomString’函数,我想我会把它实现给Lua生成一些密码盐.但是每当我调用我的移植函数时,它总是在我第一次运行程序时返回相同的输出.

以这段代码为例.

for i = 0,100 do
    print(randomString.generate(16))
end

它将始终生成相同的随机字符串列表.任何人都可以解释原因吗？提前致谢！

解决方法

math.random生成一系列伪随机数,这是一个类似于实际随机序列的确定性序列.除非使用 math.randomseed,否则math.random生成的序列将始终相同.

对于您调用math.randomseed的每个可能值,math.random将生成不同的伪随机序列.

例如,试试这个,你会看到一个不同的序列：

math.randomseed( 7654321 )
for i = 0,100 do
    print(randomString.generate(16))
end

如果你想要一个真正随机的序列,你应该在开始生成之前用随机数随机提供真正的随机数.

（编辑：李大同）

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