#迭代器
5.times { puts "Hello Woeld!" } #连续输出4次Hello World!
1.upto(10) { |i| puts "The count is #{i}" } #从1数到10
10.downto(1) { |i| puts "The count is #{i}" } #从10到1
1.step(10, 2) { |i| puts "The count is #{i}" } #从1到10，步长为2
#each,使用each方法将集合内的对象逐个取出
name = ["MZD","JZM","HJT","XJP"]
name.each do |x|
puts x
end
