路由组件与一般组件
?? ??? ??? ?1.写法不同：
?? ??? ??? ??? ??? ??? ?一般组件：<Demo/>
?? ??? ??? ??? ??? ??? ?路由组件：<Route path="/demo" component={Demo}/>
?? ??? ??? ?2.存放位置不同：
?? ??? ??? ??? ??? ??? ?一般组件：components
?? ??? ??? ??? ??? ??? ?路由组件：pages
?? ??? ??? ?3.接收到的props不同：
?? ??? ??? ??? ??? ??? ?一般组件：写组件标签时传递了什么，就能收到什么
?? ??? ??? ??? ??? ??? ?路由组件：接收到三个固定的属性
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?history:
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?go: ? go(n)
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?goBack: ? goBack()
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?goForward: ? goForward()
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?push: ? push(path, state)
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?replace: ? replace(path, state)
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?location:
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?pathname: "/about"
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?search: ""
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?state: undefined
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?match:
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?params: {}
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?path: "/about"
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?????????????????url: "/about"
