react-router4嵌套路由

import React from 'react';
import ReactDOM from 'react-dom';
import { HashRouter as Router, Route, Switch} from 'react-router-dom';
import createBrowserHistory from 'history/createBrowserHistory';
import UserAddPage from './pages/UserAdd/index';
import HomePage from './pages/Home/index';
import HomeLayout from './components/HomeLayout/index';

const hashHistory = createBrowserHistory();
const NoMatch = ({ location }) => (
  

    
无法匹配 {location.pathname}
  
)
ReactDOM.render((
  
    

      //总会加载这个组件，并且下面 swicth 里面的组件会在它里面 render 
        
          
          
          
        
      
    
  
), document.getElementById('root'));