在我的react redux reducer的任何操作之后更新数组的状态

最佳实践是处理这样的场景 reducer . 一次性处理数据并相应地更新状态。在您的场景中,您希望更新 notifications 一次数组 action

case LOGIN:
  //checks if user is valid
  return {
     ...state
     loggedIn: true,
     user,
     notifications: state.notification.push({ id: 1, message: "Logged In!" })
  }

如果你想移除 notification 你可以这样做:

case REMOVE_NOTIFICATION:
  // You can get the notification ID you want to remove from action
  let notifications = state.notification.filter(notify => notify.id !== action.id);
  return {
     ...state
     notifications
  }