Question

我是Redux的新手，并遵循了有关在React中实现Redux的教程。我遇到一个问题，似乎是从store.js的createStore函数在app.js中接收不到任何值的。有什么想法吗？

app.js

import React, { Component } from 'react';
import AppNavbar from './components/AppNavbar';
import ShoppingList from './components/ShoppingList';
import ItemModal from './components/ItemModal';
import { Container } from 'reactstrap';

import { Provider } from 'react-redux';
import store from './store';

import 'bootstrap/dist/css/bootstrap.min.css';
import './App.css';

class App extends Component {
  render() {
      return (
         <Provider store={store}>
           <div className="App">
            <AppNavbar />
            <Container>
            <ItemModal />
            <ShoppingList />
          </Container>
        </div>
      </Provider>
    );
  }
}

export default App;

store.js

 import { createStore, applyMiddleware, compose } from 'redux';
 import thunk from 'redux-thunk';
 import rootReducer from './reducers';

 const initialState = {};

 const middleware = [thunk];

const store = createStore(
  rootReducer,
  initialState,
compose(
  applyMiddleware(thunk)
  )
);

导出默认存储；

reducers文件夹 itemReducer.js-仅显示GET_ITEMS案例

import {
  GET_ITEMS,
  ADD_ITEM,
  DELETE_ITEM,
  ITEMS_LOADING
} from '../actions/types';

const initialState = {
  items: [],
  loading: false
};

export default function(state = initialState, action) {
  switch (action.type) {
    case GET_ITEMS:
      return {
        ...state,
        items: action.payload,
        loading: false
      };

index.js

import { combineReducers } from 'redux';
import itemReducer from './itemReducer';

export default combineReducers({
  item: itemReducer
});

错误：

TypeError：无法读取未定义的属性“ apply” （匿名功能） C：//client/node_modules/redux/es/redux.js：523

  return funcs.reduce(function (a, b) {
    return function () {
      return a(b.apply(undefined, arguments));
    };
  });
}

createStore C：//client/node_modules/redux/es/redux.js：87

 throw new Error('Expected the enhancer to be a function.');
 }

 return enhancer(createStore)(reducer, preloadedState);
}

if (typeof reducer !== 'function') {

./ src / store.js C：//client/src/store.js：9

const middleware = [thunk];

const store = createStore(
rootReducer,
initialState,
compose(

Answer 1

该错误与Redux DevTools Chrome扩展程序集成有关，该集成使您可以在浏览器中直观地查看Redux存储。安装Redux DevTools扩展名可以解决问题。如果您不想使用该扩展程序，则只需省略以下代码即可删除与该扩展程序的集成：

, window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__()

Redux createStore / applyMiddleWare Q

1 个答案: