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react-router v4 中的Link标签点击后为什么不会自动重绘?

使用的库名:react-router-dom

App组件(根组件)

class App extends Component {
  render() {
    return (
      <Router>
        <Div className="app">
          <Nav />
          <Body />
          <Footer />
        </Div>
      </Router>
    );
  }
}

Nav组件(导航组件)

class Nav extends Component {
  render() {
    Switch
    return <Header>
      <Brand>TSZ</Brand>
      <List>
        <li><Link to="/">Home</Link></li>
        <li><Link to="/history">History</Link></li>
        <li><Link to="/about">About</Link></li>
      </List>
    </Header>
  }
}

Body组件(路由实际内容的组件)

const Body = observer(class Body extends Component {
  render() {
      return <div style={{height: '100%'}}>
        <Route exact path="/" component={Home}/>
        <Route path="/history" component={History}/>
      </div>
  }
})

问题描述: 点击Link标签时, 页面的URL确实改变了, 但是组件却没有重绘。 请问是我哪里弄错了吗?


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