Online IDE in the documentation

Continuing the conversation on Twitter here: twitter.com/acemarke/status/913891217385168896.

I think it would be very beneficial for beginners to use CodeSandbox/Stackblitz/WebpackBin to start learning React. The environment is like a local code editor, which means that the user already gets familiar with the feel of a code editor. The user doesn't have to install any tooling, so you can start immediately. Also, whenever they want to continue offline they can easily click on 'Download'/'Export' to get a CRA version of the same application so they can work further on it.

I think we all agree that this would be beneficial, the question is how to approach this without confusing the user. Would be great to have a discussion on this here.

此 issue 未指定任何檔案或測試；請從連結的 Twitter 討論開始，並比較所提議的 CodeSandbox、Stackblitz 和 WebpackBin 方案。完成條件是就面向 React 初學者的文件達成一份整合計畫，該計畫應避免讓使用者感到困惑，並支援匯出 CRA 版本以便離線工作。