proxy设置

https://segmentfault.com/a/1190000014891894

setState后直接使用，数值更新不及时是为什么？

解答：https://medium.com/@brianwu291/learn-basic-react-setstate-function-2aec5018a38a   
官方解答：https://reactjs.org/docs/react-component.html#setstate   

详细判断浏览器运行环境

解答：https://juejin.im/post/5d0220a8f265da1bcc193c6c

媒体查询+路由

<code javascript>
npm install react-responsive --save
var MediaQuery = require('react-responsive');
class App extends Component {
    render() {
        return (
          <div>
                <MediaQuery query='(min-device-width:1224px)'>
                    <Router history={hashHistory}>
                        <Route path='/' component={PCApp}>
                            <IndexRoute component={PCNewsContainer}/>
                        </Route>
                    </Router>
               </MediaQuery>
               <MediaQuery query='(max-device-width:1224px)'>
                    <Router history={hashHistory}>
                        <Route path='/' component={MobileApp}/>
                    </Router>
               </MediaQuery>
         </div>
        );
    }
}
</code>



hook生命周期
{{::react_hook.jpg|}}