按需增量静态再生On-Demand ISR

这个页面是静态缓存的：每次访问都返回同一个「生成时间」。只有调用 revalidatePath('/') 后，它才会在 EdgeOne 上被重新生成。This page is statically cached — every visit returns the same generated time. It is only regenerated on EdgeOne after calling revalidatePath('/').

1. 反复刷新本页，上面的时间不会变（命中缓存）。Refresh repeatedly — the time above stays the same (cache hit).
2. 点击上方按钮，或调用 /api/revalidate?path=/ 触发重新验证。Click the button above, or call /api/revalidate?path=/ to trigger revalidation.
3. EdgeOne 清除该页 CDN 缓存并重新生成，稍等片刻刷新，时间就更新了。EdgeOne purges this page from the CDN and regenerates it; refresh in a moment and the time updates.

渲染时间若在几个值间跳动，是被不同边缘节点服务、各自缓存了自己再生的副本 —— 属正常。当使用确定的存储更新时，可以正常完成页面同步。If the rendered time alternates between a few values, it is served by different edge nodes each caching their own regenerated copy — this is normal. With a deterministic data source, pages sync consistently.