[英]How to use a hook in React?
我有狀態( true
或false
)的信息,我想顯示這個Navbar組件是否為真,但是當我使用鈎子時,我收到一條錯誤消息:鈎子錯誤
我的代碼:
import React from 'react';
import { BrowserRouter } from 'react-router-dom';
import { Provider } from 'react-redux';
import { ConnectedRouter } from 'connected-react-router';
import store, { history } from './reduxStore';
import AppRouterContainer from './pages/AppRouterContainer';
import Feedback from './pages/feedback/Feedback';
import Navbar from './components/Navbar/Navbar';
import { useTypedSelector } from '../src/hooks/useTypedSelector';
const isAuth = useTypedSelector((state) => state.auth.isAuth);
const App = () => (
<BrowserRouter>
<Provider store={store}>
<ConnectedRouter history={history}>
<AppRouterContainer />
{isAuth && (
<Navbar />
)}
<Feedback />
</ConnectedRouter>
</Provider>
</BrowserRouter>
);
export default App;
useTypedSelector()
鈎子需要該訪問權限)。看看這個例子:
import React from 'react';
import { Provider } from 'react-redux';
import { BrowserRouter } from 'react-router-dom';
import { ConnectedRouter } from 'connected-react-router';
import { useTypedSelector } from '../src/hooks/useTypedSelector';
import Navbar from './components/Navbar/Navbar';
import AppRouterContainer from './pages/AppRouterContainer';
import Feedback from './pages/feedback/Feedback';
import store, { history } from './reduxStore';
const NavbarWrapper = () => {
const isAuth = useTypedSelector((state) => state.auth.isAuth);
if (!isAuth) {
return null;
}
return <Navbar />;
};
const App = () => (
<BrowserRouter>
<Provider store={store}>
<ConnectedRouter history={history}>
<AppRouterContainer />
<NavbarWrapper />
<Feedback />
</ConnectedRouter>
</Provider>
</BrowserRouter>
);
export default App;
另外,我認為您應該將NavbarWrapper
組件移動到一個單獨的文件中。
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