Math.RandomGenerator 是通过 Mersenne Twister 法 来生成随机数的类。

　构造函数的格式如下。
new Math.RandomGenerator([<随机数种子>]);


　在构造函数中指定一个数值，则用这个数值来对随机数生成器进行初始化。
　在构造函数中指定由 serialize 方法保存的包含随机数生成器状态的字典对象的话，就可以用那个状态创建随机数生成器。
　如果省略构造函数，则使用基于当前时间的随机数来初始化随机数发生器 (在吉里吉里2中不是基于当前时间，而是以基于环境噪音的随机数来初始化的。

　randomize 方法用于对随机数生成器进行初始化。参数和构造函数的参数相同。

　random 方法返回大于0小于1.0的实数的随机值。

　random32 方法返回0以上4,294,967,295以下 (0xffffffff 以下) 的整数的随机值。

　random63 方法返回0以上9,223,372,036,854,775,807以下(0x7fffffffffffffff 以下) 的整数的随机值。

　random64 方法返回-9,223,372,036,854,775,808以上9,223,372,036,854,775,807以下的整数的随机值。

　serialize 方法返回记录着当前随机数生成器的状态的字典对象。将这个字典对象传入构造函数或 randomize 方法，就可以再现当前的状态。

　Mersenne Twister法的实现使用了对

A C-program for MT19937, with initialization improved 2002/2/10. Coded by Takuji Nishimura and Makoto Matsumoto.

　在使用时作了一些改动。特此感谢两位作者提供了如此实用的程序源码。

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