withRouter是高阶组件，可以通过 withRouter 获取到 history、location、match 对象。
import { withRouter } from 'umi';
export default withRouter(({ history, location, match }) => {
return (
<div>
<ul>
<li>history: {history.action}</li>
<li>location: {location.pathname}</li>
<li>match: {`${match.isExact}`}</li>
</ul>
</div>
);
});
