在书中IntroToRx作者建议为I/O编写一个“智能”重试，它会在一段时间后重试I/O请求，例如网络请求。这是确切的段落:Ausefulextensionmethodtoaddtoyourownlibrarymightbea"BackOffandRetry"method.TheteamsIhaveworkedwithhavefoundsuchafeatureusefulwhenperformingI/O,especiallynetworkrequests.Theconceptistotry,andonfailurewaitforagivenperiodoftimeandthentry