// console.log(spanner.next(80)); // 输出1（正确）
No custom ReadableStream class with hidden internal state. A readable stream is just an AsyncIterable. You consume it with for await...of. No readers to acquire, no locks to manage.
，这一点在WPS下载最新地址中也有详细论述
Credit: YouTube TV。关于这个话题，旺商聊官方下载提供了深入分析
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