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 中复现面向初学者的 Tic Tac Tutorial，并记录逐步输入代码时出现的错误。完成的标准是教程能够在 CodePen 中运行，并且其步骤能够清晰地支持练习 props 传递和 render 方法的使用。