生成0到1之间的任意随机数，可以产生一个0到1区间内均匀分布伪随机数，可以产生多个0到1区间内均匀分布伪随机数-Generate between 0-1 arbitrary random number, you can produce a 0-1 interval uniformly distributed pseudo-random number, you can have more than 0-1 interval uniformly distributed pseudo-random n