我尝试了一些解决方案，特别是 此链接 ...

我尝试更改 TodosContext.js 文件中的值，但也不起作用。 我还尝试过从另一个组件调用 useContext() 函数，但同样不起作用。

这是我的代码。 App.js:

import React, { useState, useContext } from 'react';
import TodoList from './components/TodoList';
import NewTodo from './components/NewTodo';
import { TodosProvider, TodosContext } from './components/contextapi/TodosContext';

function App() {

  const [input, setInput] = useState('');
  const [todos, setTodos] = useContext(TodosContext);

  const _handleInput = (e) => {
    setInput(e.target.value)
  }

  const _todoAdd = (e) => {
    if (e.key === 'Enter') {
      setTodos(
        [...todos, { content: input, id: Date.now(), completed: false }]
      )
      setInput('')
    }
  }

  const _todoRemove = (id) => {
    const newTodos = todos.filter(todo => todo.id !== id)
    setTodos(newTodos)
  }

  return (
    <div>
      <header>
        <h3>To-Do Manager | Context API</h3>
      </header>
      <TodosProvider>
        <NewTodo newTodo={_todoAdd} handleInput={_handleInput} newVal={input} />
        <TodoList todos={todos} />
      </TodosProvider>
    </div>
  );
}

export default App;

TodosContext.js:

import React, { useState, createContext } from 'react';

export const TodosContext = createContext()

export const TodosProvider = ({ children }) => {
    const [todos, setTodos] = useState([]);
    return (
        <TodosContext.Provider value={[todos, setTodos]}>{children}</TodosContext.Provider>
    )
}

TodoList.js:

import React, { useContext } from 'react';
import Todo from './Todo';
import RemoveTodoFromList from './RemoveTodoFromList';
import { TodosContext } from './contextapi/TodosContext'

function TodoList() {

    const [todos, setTodos] = useContext(TodosContext);

    return (
        <div>
            {todos.map(todo => (
                <div>
                    <Todo key={todo.id} todo={todo} />
                </div>
            ))}
        </div>
    )
}

export default TodoList

我真的很难解决这个问题，我花了一整天时间弄清楚哪里出了问题。谢谢！