The design of Web streams predates async iteration in JavaScript. The for await...of syntax didn't land until ES2018, two years after the Streams Standard was initially finalized. This timing meant the API couldn't initially leverage what would eventually become the idiomatic way to consume asynchronous sequences in JavaScript. Instead, the spec introduced its own reader/writer acquisition model, and that decision rippled through every aspect of the API.
2026年2月23日14时38分，众人抬牛往前挪步。南方周末记者郑丹摄
。一键获取谷歌浏览器下载对此有专业解读
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Author(s): Chongfeng Zhang, Yi Song, Leiji Li, Xiaopeng Shen, Weijun Wang, Tianchi Zhu, Fei Xiao
await checkEndpoint(url);