问无法在react-redux中显示待办事项(属性映射未定义)？

EN

/src/components/TodoList.js

import React from 'react';

const TodoList = ({todos}) => {
  return (
    <ul>
      {todos.map(todo =>
        <li key={todo.id}>{todo.text}</li>
      )}
    </ul>
  )
}

export default TodoList;

/containers/ViewTodoList.js

import React from 'react';
import {connect} from 'react-redux';
import TodoList from '../components/TodoList';

const mapStateToProps = (state) => {
  todos: state.todos
}

const ViewTodoList = connect(
  mapStateToProps
)(TodoList)

export default ViewTodoList;