1==App.js========================================
2import React from 'react';
3import PageContextProvider from './PageContextProvider';
4import Header from './Header';
5function App() {
6    return (
7        <div className="App">
8            <PageContextProvider>
9                <Header />
10            </PageContextProvider>
11        </div>
12    );
13}
14export default App;
15
16
17==PageContextProvider.js=========================
18import React, { useState, useEffect, createContext } from 'react';
19export const PageContext = createContext();
20const PageContextProvider = (props) => {
21    const [user, setUser] = useState({
22        'name': 'harry potter'
23    });
24    return (
25        <PageContext.Provider value={{ 
26            user: user,
27        }}>
28        	{props.children}
29        </PageContext.Provider>
30    );
31}
32export default PageContextProvider;
33
34
35==Header.js=====================================
36import React, { useContext } from 'react';
37import { PageContext } from './PageContextProvider';
38const Header = () => {
39    const { user } = useContext(PageContext);
40    return (
41        <div className="header">
42        	{user.name}
43        </div>
44    );
45}
46export default Header;

1export { TodosContext, default } from "./TodosContext";
2