React Router 4 has several routers built in for different purposes. The primary one you will use for building web applications is the BrowserRouter. In this lesson you will import the BrowserRouter and create some basic Route components.
After create your app with ‘creat-react-app‘, we going to install the react-router-dom:
npm i -D react-router-dom@next
Import BrowserRouter:
import {
BrowserRouter as Router,
Route
} from ‘react-router-dom‘;
Using Router:
<Router>
<div>
<Route exact path="/" component={App}></Route>
<Route path="/about" component={About}></Route>
<Route
strict
path="/about/"
render={() => <h2>About render</h2>}></Route>
<Route
path="/demo"
children={({match}) => match && <h2>demo</h2>}></Route>
</div>
</Router>
Here we use three different ways to render a component or Html to the DOM:
1. Using Component:
<Route exact path="/" component={App}></Route>
<Route path="/about" component={About}></Route>
Here the ‘exact‘ flag tells that it should match only ‘/‘.
2. Using render:
we can just render some html:
<Route strict path="/about/" render={() => <h2>About render</h2>}></Route>
3. Using children:
<Route path="/demo" children={({match}) => match && <h2>demo</h2>}></Route>
By default what we write into ‘children‘ will be rendered no matter which path it matchs.
If for example, we only want it to be shown when match ‘/demo‘, we can check whether there is a ‘match‘ object exists on props.
[React Router V4] Create Basic Routes with the React Router v4 BrowserRouter
原文：http://www.cnblogs.com/Answer1215/p/6577492.html