路由重定向

// import axios from 'axios'
import React, {
    Component
} from 'react'
import {Link,Route,Switch,Redirect} from 'react-router-dom'
import Home from './components/Home'
import About from './components/About'
import Login from './components/Login'
// import AddName from './components/Text'
import "./index.css"
class App extends Component {
    render() {
        return ( 
            <div>
            <div className="box">
               <div className="box_list">
                <div>
                  <Link to="/home"> 主页</Link>
                </div>
                <div>
                 <Link to="/about">关于</Link> 
                </div>
               </div>
               <div className="box_content">
               <Switch>
               <Route path="/home" component={Home}/>
                <Route path="/about" component={About}/>
                <Route path="/about" component={Login}/>
                <Redirect to="/home"></Redirect>
               </Switch>
               </div>
            </div>
            </div>
        )
    }
}
export default App

在route组件内定义一个redirect可以可以确定默认加载的选项