> For the complete documentation index, see [llms.txt](https://zhouhao4221.gitbook.io/haiqing-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://zhouhao4221.gitbook.io/haiqing-docs/02-design/design-decisions.md).

# 设计决策日志

## 为什么需要这个文档

设计决策有记忆损耗。几个月后，没有人记得"为什么按钮是直角而不是圆角"，新来的设计师或 AI 会觉得这是个疏漏，悄悄改掉它。

这个文档的目的是让每一个重要的设计取舍有据可查——不只记录"做了什么"，更记录"为什么这样做"。

***

## 什么值得记录

符合以下任意一条就记下来：

* **做了取舍**：有明确的备选方案被放弃，未来可能有人质疑
* **违反直觉**：选了不常见的方案，不写原因会被当 bug 改掉
* **影响范围广**：多个页面或组件都受这个决策约束
* **有时效背景**：当时的约束将来可能消失，届时决策应重新评估

不需要记录：显而易见的选择、纯实现细节、能从代码直接读出意图的决定。

***

## 记录格式

```markdown
## [编号] 标题
**日期**：YYYY-MM
**状态**：有效 / 已推翻 / 待评审

**背景**：面临什么问题，为什么需要做这个决策。

**考虑的方案**：
- 方案 A：优点是什么，缺点是什么
- 方案 B：优点是什么，缺点是什么

**决策**：选了哪个，核心理由是什么。

**影响**：会影响哪些组件或场景，有哪些已知权衡。
```

决策被推翻时，不删除原条目，在原条目末尾追加推翻说明和日期，再新建一条。

***


---

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