Медведев вышел в финал турнира в Дубае17:59
Web streams has no synchronous path. Even if your source has data ready and your transform is a pure function, you still pay for promise creation and microtask scheduling on every operation. Promises are fantastic for cases in which waiting is actually necessary, but they aren't always necessary. The new API lets you stay in sync-land when that's what you need.
，这一点在WPS官方版本下载中也有详细论述
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用。关于这个话题，Line官方版本下载提供了深入分析
self.seen_urls.add(url)，更多细节参见同城约会