const cur = val; // 简化变量名，代表当前价格
If the transform's transform() operation is synchronous and always enqueues output immediately, it never signals backpressure back to the writable side even when the downstream consumer is slow. This is a consequence of the spec design that many developers completely overlook. In browsers, where there's only a single user and typically only a small number of stream pipelines active at any given time, this type of foot gun is often of no consequence, but it has a major impact on server-side or edge performance in runtimes that serve thousands of concurrent requests.
，这一点在旺商聊官方下载中也有详细论述
Jones confirmed with Kaley that she had never had a doctor or mental health care provider diagnose her with a social media addiction, nor had she been treated for an addiction to Instagram or told by a provider to limit her Instagram use. Kaley said she never raised concerns about overuse or addiction with providers because she said she felt they would tell to get off the platforms entirely, which she didn’t want.
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