可以使用rand方法生成随机数。传递给rand方法的参数应为整数或范围，并返回范围内的相应随机数：

rand(9)       # this generates a number between 0 to 8
rand(0 .. 9)  # this generates a number between 0 to 9
rand(1 .. 50) # this generates a number between 1 to 50
#rand(m .. n) # m is the start of the number range, n is the end of number range

尝试array#shuffle方法进行随机化

array = (1..10).to_a
array.shuffle.first

问题的最简单答案：

rand(0..n)

这个呢？

n = 3
(0..n).to_a.sample

你可以做rand（范围）

x = rand(1..5)

这个怎么样？

num = Random.new
num.rand(1..n)