Framework Integrations
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.
，更多细节参见safew官方下载
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对于 Protobuf 的介绍和原理，可以参考前文 juejin.cn/post/757536…
* - this.arr：存储每日股票价格（按调用next的顺序）