条件路由（feature/bugfix 分流）
import requests
。业内人士推荐safew官方版本下载作为进阶阅读
第二个动作是 「善用实况照片（Live Photo）」。
What follows is a proof of concept — not a finished standard, not a production-ready library, not even necessarily a concrete proposal for something new, but a starting point for discussion that demonstrates the problems with Web streams aren't inherent to streaming itself; they're consequences of specific design choices that could be made differently. Whether this exact API is the right answer is less important than whether it sparks a productive conversation about what we actually need from a streaming primitive.
const posToTime = new Map(); // 映射：位置 → 到达终点的时间