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
