javascript - 刷新页面后如何正确保存 Redux 状态？

Question

请求代码:

export class LogInContainer extends Component {

  submit = (values) => {
    const { mutate } = this.props;
    mutate({
      variables: {
        email: values.email,
        password: values.password,
      },
    })
      .then((res) => {
        const token = res.data.login.token;
        localStorage.setItem("token", token);
        const user = res.data.login.user;
        const { logIn } = this.props;
        logIn(user);
        this.props.history.push("/pages/processes");
      })
      .catch((error) => {
        const errorMessage = error.message;
        const { logInError } = this.props;
        logInError(errorMessage);
      });
  };

  render() {
    const { error, logInCleanError } = this.props;
    return (
      <LogIn
        onSubmit={this.submit}
        errorMessage={error}
        logInCleanError={logInCleanError}
      />
    );
  }
}

export default compose(
  graphql(LOG_IN),
  withRouter,
  connect(({ errors }) => ({ error: errors.log_in_error }), {
    logInError,
    logInCleanError,
    logIn,
  })
)(LogInContainer);

reducer 代码:

const initialState = {
  user: {
    id: "",
    firstName: "",
    secondName: "",
    email: "",
    isAuth: localStorage.getItem('token') ? true : false,
  },
};

export const userReducer = (state = initialState, { type, user }) => {
  switch (type) {
    case LOG_IN:
      return {
        ...state,
        user: {
          id: user.id,
          firstName: user.firstName,
          secondName: user.secondName,
          email: user.email,
          isAuth: true,
        },
      };
    case CURRENT_USER:
      return {
        ...state,
        user: {
          id: user.id,
          firstName: user.firstName,
          secondName: user.secondName,
          email: user.email,
          isAuth: true,
        },
      };
    case LOG_OUT:
      return {
        ...state,
        user: {
          id: "",
          firstName: "",
          secondName: "",
          email: "",
          isAuth: false,
        },
      };
    default:
      return state;
  }
};

我保存 JWT 并将其放在每个请求的 header 中，例如:

const client = new ApolloClient({
  uri: "http://localhost:4000/api",
  request: (operation) => {
    const token = localStorage.getItem("token");
    operation.setContext({
      headers: {
        authorization: token ? `Bearer ${token}` : "",
      },
    });
  },
}); 

我保护我的路由器，例如:

const App = ({ authorized }) => {
  return (
    <Switch>
      {!authorized ? (
        <Route path="/auth">
          <Auth />
        </Route>
      ) : (
        <Route path="/pages">
          <Pages />
        </Route>
      )}
      <Redirect from="/" to="/auth/login" />
    </Switch>
  );
};

export default App;

刷新正在登录的页面后，我并没有丢失 JWT 并留在系统中，但是我丢失了需要在页面上显示的用户名、第二名等的 redux 状态。那么在没有像 redux-persist 或其他插件的情况下保存 redux 状态的正确方法是什么

Answer 1

🎈 马上

做这个:

const initialState = {
  user: {
    id: localStorage.getItem('id') || '',
    firstName: localStorage.getItem('firstName') || '',
    secondName: localStorage.getItem('secondName') || '',
    email: localStorage.getItem('email') || '',
    isAuth: localStorage.getItem('token') ? true : false,
  },
}

📿 有点复杂但可扩展的方式

创建 middleware这将服务于与应用程序持久状态相关的所有内容。在那里，您可以将数据保存到 localStorage、cookie 或 IndexedDB。中间件，我们称之为 LocalStoreMiddleware 将监听你的 redux reducer 所做的相同操作，当一个操作将被分派(dispatch)时，无论在哪里以及由谁(组件、Saga、Socket)每个中间件将完成其负责的工作，reducers 将更新 redux 存储， LocalStoreMiddleware 会将数据保存到 localStorage、cookie、indexDB 等。

优势

没有紧密的依赖关系

易于扩展

一地一域业务逻辑

你让纳尼亚世界的一些 Sprite 开心

创建一个文件，您将在其中存储与持久数据相关的函数

// local-store-resolvers.js
import {on} from './local-store-middleware.js'

function saveToken(action, state) {
  localStorage.setItem('token', JSON.stringify(state.token));
}

function saveUsername(action) {
  localStorage.setItem('username', JSON.stringify(action.username));
}

export default [
  on(AUTHORIZATION, saveToken),
  on(USERNAME_CHANGED, saveUsername),
]

中间件厂

// local-store-middleware.js
export const on = (actionType, resolver) => (action, state) => (
  actionType === action.type && resolver(action, state)
)

const createLocalStoreMiddleware = resolvers => store => next => action => {
  resolvers.forEach(
    resolver => resolver(action, store.getState())
  )
  return next(action)
}

export default createLocalStoreMiddleware

Redux 商店

// src/store/index.js - your main file where you create redux store
import createLocalStoreMiddleware from './local-store-middleware.js'
import resolvers from './local-store-resolvers.js'

const localStore = createLocalStoreMiddleware(resolvers)

const store = createStore(
  combineReducers({users, someOtherReducer}),
  applyMiddleware(localStore), // if you have more middlewares use compose
)

export default store