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[英]How do I keep App() level state from resetting with react-router-dom in React.js?
[英]React context keep resetting
我有這個文件,其中包含我所有的全局路由/全局 state。
import React, { useEffect, useState, useContext } from "react";
import ReactDOM from 'react-dom';
const globalState = {
email: null,
token: null
};
export const AuthContext = React.createContext(globalState);
function Routing() {
const [currentUser, setCurrentUser] = useState(globalState);
return (
<AuthContext.Provider value={[currentUser, setCurrentUser]}>
</AuthContext.Provider>
);
}
ReactDOM.render(<Routing />, document.getElementById("app"));
serviceWorker.unregister();
問題是當我嘗試使用此 function 注銷時,全局 state 更改了大約 3 秒,然后再次重置。“用戶再次自動登錄”。
const [user, setUser] = useContext(AuthContext);
const logOut = () => {
setUser({email: null, token:null})
}
我試圖查看是否有任何特殊方法可以更改全局上下文,但我沒有找到任何東西。
如何停止AuthContext“全局狀態”的重新登錄“重新改變狀態”
這是我的登錄信息
const login = e => {
const form = document.getElementById('loginForm');
e.preventDefault();
setInterval(() => {
setUser({email, token});
}, timeOut);
})
}
您的代碼沒有演示您描述的內容,這是您的代碼,我沒有看到它在 3 秒后神奇地注銷,所以您一定在其他地方做錯了什么:
const { useState, useContext } = React; const globalState = { email: null, token: null, }; const AuthContext = React.createContext(globalState); const LoginOut = () => { const [user, setUser] = useContext(AuthContext); const logOut = () => { setUser({ email: null, token: null }); }; const login = () => { setUser({ email: 'hi', token: 123 }); }; return user.email? ( <button onClick={logOut}>log out {user.email}</button> ): ( <button onClick={login}>log in</button> ); }; function Routing() { const [currentUser, setCurrentUser] = useState( globalState ); return ( <AuthContext.Provider value={[currentUser, setCurrentUser]} > <LoginOut /> </AuthContext.Provider> ); } ReactDOM.render( <Routing />, document.getElementById('root') );
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.8.4/umd/react.production.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.4/umd/react-dom.production.min.js"></script> <div id="root"></div>
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