async data

数据在不同的端的传递总是异步的，这是现代web应用编程的基础，任何都是借助网络，为了处理好网络的延迟问题，出现了多种多样的理论。
- 缓存
- 数据同步
- 并发
- pub/sub

也有各种各样的规范
- ddp
- promise A+
- reactive xxx
- saga

网络的东西真是博大精深，尝试搜索了相关的书籍，但未找到任何系统的介绍相关理论的，决定先 mark，作为一个课题来研究，产出结果就是相关的系统理论
## books
- A Theory of Distributed Objects
## products
- firebase
- parse

The issue is a research note about asynchronous data handling theories and technologies in web applications. It lists concepts like caching, data sync, concurrency, pub/sub, and specs like DDP, Promise A+, reactive patterns, and saga. Start by exploring the repository's content to see if there's existing documentation or a blog structure. The goal is to produce a systematic theoretical output, but no specific files, tests, or actionable steps are mentioned.

Escrita pelo modelo de indexação a partir do texto da issue.