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Most userland implementations of custom ReadableStream instances do not typically bother with all the ceremony required to correctly implement both default and BYOB read support in a single stream – and for good reason. It's difficult to get right and most of the time consuming code is typically going to fallback on the default read path. The example below shows what a "correct" implementation would need to do. It's big, complex, and error prone, and not a level of complexity that the typical developer really wants to have to deal with:
，更多细节参见爱思助手下载最新版本
他店里的货，大多通过加盟体系从总部订购。每个加盟商有对接群，在群里下单。长保产品走普通物流，甜品、短保产品走冷链车，当天订货、当天送达，总部货源则由一线城市直采。若碰上总部没货但顾客有需求，王嫂会自己开车去邻近的合肥、南京，甚至上海采买，也是当天往返。
But other stuff…? It was just goofing off: