1.能稍微讲下 inspect 的作用么.. 2.为什么改后输出结果有下面那个差别 3.在 ruby doc 里说 inspect 方法是，通过字符返回这个环境的内容。感觉不太理解这句话呢...求解释一下 4.谢谢了！ flash = { success: "It worked!", error: "It failed." } flash.each do |key, value| puts "Key #{key} has value #{value}" end

输出： Key :success has value "It worked!" Key :error has value "It failed."

和

flash = { success: "It worked!", error: "It failed." } flash.each do |key, value| puts "Key #{key.inspect} has value #{value.inspect}" end

输出： Key success has value It worked! Key error has value It failed.