React Router 更改 URL 但不更新页面，除非它从浏览器刷新

Question

所以我在 YouTube 上看了很多关于 React 初学者的教程， 但是，我在此 URL (localhost/) 并单击设置按钮将 URL 更改为 (localhost/settings) 并且不会在浏览器中自动执行，如果我使用 URL (localhost/settings) 刷新浏览器，则从 Settings.js 更新和呈现的页面

如果您介意帮助我，这是我的代码和 JS： header.js

class Header extends Component {

    state = {
        MainMenuAppeared:false
    }

    MainMenuShow = () =>{
        this.setState({
            MainMenuAppeared: true
        })
    }

    MainMenuHide = () =>{
        this.setState({
            MainMenuAppeared: false
        })
    }

    render() {
        return (
            <div className="Header">
              <header>
                  {this.state.MainMenuAppeared ? (
                    <div id="logo" onClick={this.MainMenuHide}><WebLogo /></div>
                  ) : (
                    <div id="logo" onClick={this.MainMenuShow}><WebLogo /></div>
                  )}

                {this.state.MainMenuAppeared ?(
                    <Router>
                <div id="MainMenu">
                    <Link to="/"><div className="MenuLists">Home</div></Link>
                    <Link to="/settings"><div className="MenuLists">Settings</div></Link>
                </div></Router>) : (<div></div>)}
              </header>
            </div>
          );
    }
}

Main.js（以前的 App.js）

function Main() {
  return (
    <div className="Main">
      <Header />
      <br></br>
      <br></br>
      <br></br>
      <Router>
        <Switch>
          <Route exact path="/" component={Home} />
          <Route path="/settings" component={Settings}/>
        </Switch>
      </Router>
    </div>
  );
}

Settings.js

function Settings() {
  return (
    <div className="Settings">
     Settings
    </div>
  );
}

Answer 1

您的Header 组件应该在Router 组件内。 工作Codesandbox link

<div className="Main">
  <Router>
    <Header />
    <br />
    <br />
    <br />
    <Switch>
      <Route exact path="/" component={Home} />
      <Route path="/settings" component={Settings} />
    </Switch>
  </Router>
</div>

让我知道它是否有效！！！

Answer 2

组件树顶部应该有一个Router。因此，只需将您的 Header 移动到 Router 内即可

function Main() {
  return (
    <div className="Main">
      <Router>
        <Header />
        <br></br>
        <br></br>
        <br></br>
     
        <Switch>
          <Route path="/settings" component={Settings}/>
          <Route exact path="/" component={Home} />
        </Switch>
      </Router>
    </div>
  );
}

并从Header 本身中删除第二个Router：

class Header extends Component {
  state = {
    MainMenuAppeared: false
  };

  MainMenuShow = () => {
    this.setState({
      MainMenuAppeared: true
    });
  };

  MainMenuHide = () => {
    this.setState({
      MainMenuAppeared: false
    });
  };

  render() {
    return (
      <div className="Header">
        <header>
          {this.state.MainMenuAppeared ? (
            <div id="logo" onClick={this.MainMenuHide}>
              <WebLogo />
            </div>
          ) : (
            <div id="logo" onClick={this.MainMenuShow}>
              <WebLogo />
            </div>
          )}

          {this.state.MainMenuAppeared && (
           
              <div id="MainMenu">
                <Link to="/">
                  <div className="MenuLists">Home</div>
                </Link>
                <Link to="/settings">
                  <div className="MenuLists">Settings</div>
                </Link>
              </div>
           
          )}
        </header>
      </div>
    );
  }
}