React Redux是一个用于构建可扩展的、可维护的应用程序的库。在使用React Redux进行状态管理时，我们通常会使用`mapStateToProps`函数来将Redux中的状态映射到组件的props上。但是，有时候我们可能只需要部分状态，而不是全部状态。那么，我们是否可以让`mapStateToProps`只接受部分状态呢？答案是肯定的。

javascript
// reducer.js
const initialState = {
  counter: 0
};
const reducer = (state = initialState, action) => {
  switch (action.type) {
    case 'INCREMENT':
      return {
        ...state,
        counter: state.counter + 1
      };
    case 'DECREMENT':
      return {
        ...state,
        counter: state.counter - 1
      };
    default:
      return state;
  }
};
export default reducer;

javascript
// App.js
import React from 'react';
import { Provider } from 'react-redux';
import { createStore } from 'redux';
import reducer from './reducer';
import Counter from './Counter';
const store = createStore(reducer);
const App = () => {
  return (
    
      
    
  );
};
export default App;

javascript
// Counter.js
import React from 'react';
import { connect } from 'react-redux';
const Counter = ({ counter }) => {
  return (
    
      
{counter}
      Increment
      Decrement
    
  );
};
const mapStateToProps = (state) => {
  return {
    counter: state.counter
  };
};
export default connect(mapStateToProps)(Counter);