如何在其他组件的属性中调用组件？

// 确保父组件的状态更新
this.setState({ key: newValue });

// 子组件中避免不必要的渲染
shouldComponentUpdate(nextProps, nextState) {
  return nextProps.key !== this.props.key;
}

// 创建Context
const MyContext = React.createContext();

// 提供Context
<MyContext.Provider value={/* some value */}>
  <ChildComponent />
</MyContext.Provider>

// 在子组件中使用Context
class ChildComponent extends React.Component {
  static contextType = MyContext;

  render() {
    const value = this.context;
    // 使用value
  }
}

// Redux示例
import { createStore } from 'redux';

const initialState = { count: 0 };

function reducer(state = initialState, action) {
  switch (action.type) {
    case 'INCREMENT':
      return { count: state.count + 1 };
    default:
      return state;
  }
}

const store = createStore(reducer);

store.subscribe(() => {
  console.log(store.getState());
});

store.dispatch({ type: 'INCREMENT' });