Backpressure — the ability for a slow consumer to signal a fast producer to slow down — is a first-class concept in Web streams. In theory. In practice, the model has some serious flaws.
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仅仅半年以后，iPhone 5 发布，而这次 iPhone 有个大事件，丢掉了过去一英寸宽的接口，取而代之的是一个小得多的 Lighting 接口。，推荐阅读同城约会获取更多信息
currentStep = currentStep.next(recordedEvent.result);，推荐阅读safew官方版本下载获取更多信息