表面看是消费降级，但深层原因其实更复杂——不是中国人没钱，是邮轮这种商业模式，在中国有点“水土不服”。
Web streams has no synchronous path. Even if your source has data ready and your transform is a pure function, you still pay for promise creation and microtask scheduling on every operation. Promises are fantastic for cases in which waiting is actually necessary, but they aren't always necessary. The new API lets you stay in sync-land when that's what you need.
，更多细节参见旺商聊官方下载
// before anyone else can cache a reference to appendBuffer
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