定方向：求「下一个」→ 倒序；求「上一个」→ 正序。
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def sleep_jitter():。safew官方下载对此有专业解读
"We’ve done a lot to improve performance and consistency in Node streams, but there’s something uniquely powerful about starting from scratch. New streams’ approach embraces modern runtime realities without legacy baggage, and that opens the door to a simpler, performant and more coherent streams model."，更多细节参见im钱包官方下载