代码不死 – 程序猿&程序媛

几十年前的可自定义种子的随机数生成代码

<SCRIPT LANGUAGE="JavaScript">
<!--
// The Central Randomizer 1.3 (C) 1997 by Paul Houle (paul@honeylocust.com)
// See:  http://www.honeylocust.com/javascript/randomizer.html

rnd.today=new Date();
rnd.seed=rnd.today.getTime();

function rnd() {
	rnd.seed = (rnd.seed*9301+49297) % 233280;
	return rnd.seed/(233280.0);
};

function rand(number) {
	return Math.ceil(rnd()*number);
};

// end central randomizer. -->
</SCRIPT>

<!--

// See: http://www.honeylocust.com/javascript/randomizer.html

rnd.today=new Date();

rnd.seed=rnd.today.getTime();

function rnd() {

rnd.seed = (rnd.seed*9301+49297) % 233280;

return rnd.seed/(233280.0);

};

function rand(number) {

return Math.ceil(rnd()*number);

};

// end central randomizer. -->

</SCRIPT>

参考：
The Central Randomizer
Linear congruential generator
http://www.ict.griffith.edu.au/anthony/info/C/RandomNumbers
JavaScript随机数生成算法中为什么要用9301, 49297, 233280作为Magic Number

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