> For the complete documentation index, see [llms.txt](https://jieandze1314.osca.top/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jieandze1314.osca.top/01.md).

# 1 准备篇：背景知识

万事开头难，背景知识补充是必须的。