错误:无效的挂钩调用。钩子只能在函数组件的主体内部调用。这可能是由于以下原因之一造成的:
./src/index.js/ 5 |从'./reportWebVitals'导入reportWebVitals; 6 |进口
"../node_modules/bootstrap/dist/css/bootstrap.min.css"; 7 |进口
{ BrowserRouter 作为路由器} 来自'react-router-dom'; 8 | ReactDOM.render( 9 | 10 | 11 | , 在 App.js 文件中包含导航组件后,出现无效钩子调用错误,下面是我的 app.js 文件代码 移除导航组件后错误不出现下面是index.js文件代码 导航.js 谁能帮我解决这个问题?import React from "react";
import Home from "./components/Home";
import About from "./components/About";
import { Route, Switch } from "react-router-dom";
import Navigation from "./Navigation";
export default function App() {
return (
<div className="app">
<Navigation />
<Switch>
<Route path="/about" component={About} />
<Route path="/" component={Home} />
</Switch>
</div>
);
}
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import reportWebVitals from './reportWebVitals';
import "../node_modules/bootstrap/dist/css/bootstrap.min.css";
import { BrowserRouter as Router} from 'react-router-dom';
ReactDOM.render(
<Router>
<App/>
</Router>,
document.getElementById('root')
);
// If you want to start measuring performance in your app, pass a function
// to log results (for example: reportWebVitals(console.log))
// or send to an analytics endpoint. Learn more:
reportWebVitals();
import { Navbar, Nav, Container } from 'react-bootstrap';
import React from 'react'
export default function Navigation() {
return (
<>
<Navbar collapseOnSelect fixed="top" expand="sm" bg="dark" variant="dark">
<Container>
<Navbar.Toggle aria-controls="responsive-navbar-nav" />
<Navbar.Collapse id="responsive-navbar-nav">
<Nav>
<Nav.Link href="/">Home</Nav.Link>
<Nav.Link href="/about">About</Nav.Link>
</Nav>
</Navbar.Collapse>
</Container>
</Navbar>
</>
)
}