任何一个单元格在同一时刻最多有 8 个邻居单元格。
- Any live cell with two or three live neighbours survives.
- Any dead cell with three live neighbours becomes a live cell.
- All other live cells die in the next generation. Similarly, all other dead cells stay dead.
不要直接改变当前二维数组内 Cells（state），每个迭代都根据当前二维数组内 neighbors（3~8 个相邻单元格）的状态来生成一份新的二维数组。视图更新就交给 reactjs（或者 vuejs 也是可以的）。
master分支的代码运行时 CPU 占用较高，native-dom-rerender这个分支使用原生 DOM API 重新渲染表格，CPU 占用大大降低。
更新：native-dom-rerender 分支已经合并到 master 分支。
实现康威生命游戏最合适的数据结构是二维数组，react 对于这种表格类型的渲染（100 行 60 列，每个单元格是否需要重新渲染随机性比较大）太耗 CPU，100 毫秒迭代一次的话，用 react 重新渲染 cpu 大约占用 120%~130%，用原生 DOM API 来更新的话，cpu 占用下降到 34%左右。200 毫秒迭代一次的话 cpu 占用大约稳定在 11%左右。react 重新渲染做的事情太多了，很难优化掉。
iterate(主要是getAliveNeighbors) 方法也做了重构优化，比之前的版本性能好得多（100 多毫秒降到 10 几毫秒）。
This project was bootstrapped with Create React App.
In the project directory, you can run:
Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.
The page will reload if you make edits.
You will also see any lint errors in the console.
Launches the test runner in the interactive watch mode.
See the section about running tests for more information.
Builds the app for production to the build folder.
It correctly bundles React in production mode and optimizes the build for the best performance.
The build is minified and the filenames include the hashes.
Your app is ready to be deployed!
See the section about deployment for more information.
Note: this is a one-way operation. Once you eject, you can’t go back!
If you aren’t satisfied with the build tool and configuration choices, you can eject at any time. This command will remove the single build dependency from your project.
Instead, it will copy all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except eject will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
You don’t have to ever use eject. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
You can learn more in the Create React App documentation.
To learn React, check out the React documentation.
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