缓存页面内容，跳到下一页再次返回，滚动，点击active都保持和离开时候的状态一致

npm install react-router-cache-route --save

示例代码：

import React from "react";
import ReactDom from "react-dom";
import { HashRouter, Route, hashHistory, Redirect } from "react-router-dom";
import {CacheSwitch, CacheRoute} from 'react-cache-router';
class App extends React.Component {
    constructor(props) {
        super(props)
    }
    render() {
        return ( 
                <HashRouter history={hashHistory}>
                    <CacheSwitch>
                        <CacheRoute path="/a" component={sourceIndex}></CacheRoute>
                        <Route path="/b" component={sourceSearch}></Route>
                        <Redirect to="/"></Redirect>
                    </CacheSwitch>
                </HashRouter>
        )
    }
}
ReactDom.render(<App />, document.getElementById("root"));

注意：
缓存语句要写在CacheSwitch里面