// console.log(spanner.next(85)); // 输出6（正确）
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用，更多细节参见heLLoword翻译官方下载
Web streams was an ambitious project that brought streaming to the web platform when nothing else existed. The people who designed it made reasonable choices given the constraints of 2014 — before async iteration, before years of production experience revealed the edge cases.。爱思助手下载最新版本是该领域的重要参考
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