https://nextjs.org/docs/advanced-features/automatic-static-optimization

Automatic Static Optimization

How it works

If getServerSideProps or getInitialProps is present in a page, Next.js will switch to render the page on-demand, per-request (meaning Server-Side Rendering).
If the above is not the case, Next.js will statically optimize your page automatically by prerendering the page to static HTML.
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Static HTML Export

next export allows you to export your Next.js application to static HTML, which can be run standalone without the need of a Node.js server.
静态导出不需要next自带的node服务
It is recommended to only use next export if you don’t need any of the unsupported features requiring a server.
包含一下功能的，则 next export不支持
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项目需要国际化路由，如果使用export则失败并提示不支持
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