react學習第六天

react路由：

![graph TD;
A-->B;
B-->C;](https://img-blog.csdnimg.cn/20200804230919983.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RoZV9sb3dlcg==,size_16,color_FFFFFF,t_70)