react路由

主页，登陆，注册

return (

         

            
                
                

                

                

                

            

         
    );

react router 基础组件

// Routers
 and 

// Route Matching
 and 

component  render  children

// Navigation
 and 

• 参考

react router https://reacttraining.com/react-router/web/guides/basic-components