React tutorial appears to be broken

The beginners Tic Tac Tutorial produces errors when the code is entered into Codepen.io
There is no way to get Codepen to register the code as correct except when copy pasting the end demo file.
I'm more muddled by the concepts of react after this tutorial rather than informed and practiced by following it.
Rather better way would be to 1) one small module that lets you practice prop passing 2) one small module that lets you define the js code that will use the render method and so forth. The current tutorial seems a stream of thought and as a whole incoherent as a demonstration of reacts strengths.

首先在 CodePen.io 中重現適合初學者的 Tic Tac Tutorial，並記錄逐步輸入程式碼時發生的錯誤。完成的標準是教學能在 CodePen 中運作，且其步驟能清楚地支援練習 props 傳遞和 render 方法的使用。