Question

我收到了TypeError：中间件不是函数。有一些类似的问题和答案在我的案例中似乎并不适用。我打算制作一个axios /异步请求。这是我的index.js文件的实现：

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import registerServiceWorker from './registerServiceWorker';
import  { Provider }  from 'react-redux';
import { createStore, combineReducers, applyMiddleware } from 'redux';
import axios from 'axios';
import thunk from 'redux-thunk';
import logger from 'redux-logger';

const PATH_BASE = 'https://itunes.apple.com/search';
const PATH_TERM = 'term=';
const COUNTRY = 'country=es';
const ALBUMS = 'entity=album';
const LIMIT = 'limit=60';

const booleanReducer = (state = { grid:true, additionalPages:false }, action) => {
  if (action.type === 'GRID'){
    return state = {
      ...state,
      grid:!state.grid
    }
  }
  if (action.type === 'ADDITIONALPAGES'){
    return state = {
      ...state,
      additionalPages:!state.additionalPages
    }
  }
  return state;
};

const searchItunesReducer = (state = { searchTerm:'', itunes:null }, action) => {
  if (action.type === 'SEARCHTERM'){
    return state = {
      ...state,
      searchTerm:action.payload
      }
    }
  if (action.type === 'FETCHITUNESALBUMS'){
    return state = {
      ...state,

      }
    }
      return state;
  }

const middleware = applyMiddleware(thunk, logger());
const store = createStore(combineReducers({booleanReducer,searchItunesReducer}),middleware);
console.log(store.getState());

store.subscribe(() =>{
  console.log("store updated!", store.getState());
});

registerServiceWorker();
ReactDOM.render(
<Provider store={store}>
  <App />
  </Provider>

, document.getElementById('root'));

如果我删除行const middleware = applyMiddleware(thunk, logger());和const middleware const store该应用加载但没有问题。我在这里做错了什么？

Answer 1

React / Redux教程中的这段代码也存在相同的问题：

不为我工作：

    import { applyMiddleware, createStore } from "redux";
    import thunk from "redux-thunk";
    import promise from "redux-promise-middleware";
    import { composeWithDevTools } from 'redux-devtools-extension';
    import rootReducer from "./reducers";
    const middleware = composeWithDevTools(applyMiddleware(promise(), thunk));
    export default createStore(rootReducer, middleware);

我的解决方案：因为createStore（）函数正在请求一个函数，所以我创建了一个。由于某些原因（或我没有正确执行）而无法接受箭头功能。我也修改了promise（）函数调用，只声明了一个参数。这使我经历了编译。

import { applyMiddleware, createStore } from "redux";
import thunk from "redux-thunk";
import  promise from "redux-promise-middleware";
import { composeWithDevTools } from 'redux-devtools-extension';
import rootReducer from "./reducers";

function middleware() {
    return composeWithDevTools(applyMiddleware(promise, thunk));
}

export default createStore(rootReducer, middleware());

Redux返回“中间件不是函数”

1 个答案: