> For the complete documentation index, see [llms.txt](https://learn.js.cool/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://learn.js.cool/practice.md).

# 项目实战

- [随机数字id](https://learn.js.cool/practice/random-id.md): MySQL不使用自增id，兼容异地分布。