如何正确检查redux saga中的网络状态

// redux-network-status.js
const initialState = {
  isConnected: false,
};

export const networkStatusReducer = (state = initialState, action) => {
  switch (action.type) {
    case 'UPDATE_NETWORK_STATUS':
      return {
        ...state,
        isConnected: action.payload,
      };
    default:
      return state;
  }
};

// saga.js
import { takeEvery, select, put } from 'redux-saga/effects';

function* fetchDataSaga(action) {
  // 获取网络状态
  const isConnected = yield select(state => state.networkStatus.isConnected);

  if (isConnected) {
    // 执行网络请求
    try {
      // 发起网络请求的代码
      yield put({ type: 'FETCH_DATA_SUCCESS', payload: response.data });
    } catch (error) {
      yield put({ type: 'FETCH_DATA_FAILURE', error });
    }
  } else {
    // 处理离线状态
    // 可以进行缓存或显示错误信息
    yield put({ type: 'OFFLINE_MODE', payload: 'You are currently offline.' });
  }
}

function* watchFetchData() {
  yield takeEvery('FETCH_DATA', fetchDataSaga);
}

export default function* rootSaga() {
  yield all([
    watchFetchData(),
    // 其他saga函数
  ]);
}