#迭代器5.times{puts"HelloWoeld!"}#连续输出4次HelloWorld!1.upto(10){|i|puts"Thecountis#{i}"}#从1数到1010.downto(1){|i|puts"Thecountis#{i}"}#从10到11.step(10,2){|i|puts"Thecountis#{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.eachdo|x|putsxend