一:迭代
5.times { print "*" }
3.upto(6) {|i| print i }
('a'..'e').each {|char| print char }
结果:
*****3456abcde
5.times { print "*" }
3.upto(6) {|i| print i }
('a'..'e').each {|char| print char }
结果:
*****3456abcde