import React from 'react';
//withRouter可以加工一般组件，让一般组件具备路由组件所特有的API
//withRouter的返回值是一个新组件
import { withRouter } from 'react-router';

class Header extends React.Component {
  back = () => {
    this.props.history.goBack()
  }
  render() {
    return (
      <div className="page-header">
        <h2>React Router Demo</h2>
        <button onClick={this.back}>回退</button>
      </div>
    )
  }
}
export default withRouter(Header)