赞！是不是在讲了what is fiber的同时，还可以补充说下why fiber以及 how fiber

[xuzeshen]

如题

[wang1212]

@xuzeshen Maybe you can look here:

• https://reactjs.org/docs/codebase-overview.html#fiber-reconciler
• https://github.com/acdlite/react-fiber-architecture