摘要： #初始化a = Array.newp a #=>[]a = Array.new(5)p a #=>[nil, nil, nil, nil, nil]a = Array.new(5,0)p a #=>[0, 0, 0, 0, 0]city = ["北京", "上海", "广州"] p city #=> ["北京", ... 阅读全文