Javascript 对道具的Redux连接状态作出反应

我正在尝试为react应用程序设置应用商店，我无法将应用商店连接到组件。我看了官方的例子，但看不出哪里出了错

无法读取未定义的属性“app”

在

app.js

中，它说

状态

是未定义的，我的理解是

提供者

将此传递下去。我不确定我是否忽略了一些简单的事情，但我现在很困惑

编辑：我现在已经添加了所有涉及的文件

root.js

import React, { Component } from 'react';
import { Provider } from 'react-redux';
import configureStore from '../configureStore';
import App from './app';

const store = configureStore();

export default class Root extends Component {
  render() {
    return(
      <Provider store={store}>
        <App />
      </Provider>
    )
  }
}

import React, { Component, PropTypes } from 'react';
import {render} from 'react-dom';
import { connect } from 'react-redux';
import { fetchFixtures } from '../actions';

const mapStateToProps = (state) => {
  return {
    fixtures: state.app.fixtures
  }
}

class App extends Component {
  constructor(props) {
    super(props);
  }

  componentDidMount() {
    const { dispatch, selectedSubreddit } = this.props;
  }

  render() {
    return(
      <div></div>
    )
  }
}

export default connect(mapStateToProps)(App);

import {createStore} from 'redux';
import Reducer from './reducers';

let initialState = {
  app: {
    teams: [],
    fixtures: [],
    manifesto: []
  }
}

export default function configureStore(initialState) {
  return createStore(
    Reducer,
    initialState
  )
}

export function fetchFixtures(url) {
  return fetch(url)
    .then(res => res.json())
    .then(json => dispatch(recieveFixtures(json)))
    .catch((err) => {
      console.log(err);
    });
}

function recieveFixtures(json) {
  return {
    type: ADD_FIXTURES,
    fixtures: json.fixtures.map(fixture => fixture)
  }
}

function euroSweep(state, action) {
  switch (action.type) {
    case 'ADD_FIXTURES':
      let newState = Object.assign({}, state);
      return newState;
    default:
      return state;
  }
}

export default euroSweep;

import React, {Component} from 'react';
import {render} from 'react-dom';
import Root from './containers/root';

render(
  <Root />, document.querySelector('.app')
)

configureStore.js

import React, { Component } from 'react';
import { Provider } from 'react-redux';
import configureStore from '../configureStore';
import App from './app';

const store = configureStore();

export default class Root extends Component {
  render() {
    return(
      <Provider store={store}>
        <App />
      </Provider>
    )
  }
}

import React, { Component, PropTypes } from 'react';
import {render} from 'react-dom';
import { connect } from 'react-redux';
import { fetchFixtures } from '../actions';

const mapStateToProps = (state) => {
  return {
    fixtures: state.app.fixtures
  }
}

class App extends Component {
  constructor(props) {
    super(props);
  }

  componentDidMount() {
    const { dispatch, selectedSubreddit } = this.props;
  }

  render() {
    return(
      <div></div>
    )
  }
}

export default connect(mapStateToProps)(App);

import {createStore} from 'redux';
import Reducer from './reducers';

let initialState = {
  app: {
    teams: [],
    fixtures: [],
    manifesto: []
  }
}

export default function configureStore(initialState) {
  return createStore(
    Reducer,
    initialState
  )
}

export function fetchFixtures(url) {
  return fetch(url)
    .then(res => res.json())
    .then(json => dispatch(recieveFixtures(json)))
    .catch((err) => {
      console.log(err);
    });
}

function recieveFixtures(json) {
  return {
    type: ADD_FIXTURES,
    fixtures: json.fixtures.map(fixture => fixture)
  }
}

function euroSweep(state, action) {
  switch (action.type) {
    case 'ADD_FIXTURES':
      let newState = Object.assign({}, state);
      return newState;
    default:
      return state;
  }
}

export default euroSweep;

import React, {Component} from 'react';
import {render} from 'react-dom';
import Root from './containers/root';

render(
  <Root />, document.querySelector('.app')
)

actions.js

import React, { Component } from 'react';
import { Provider } from 'react-redux';
import configureStore from '../configureStore';
import App from './app';

const store = configureStore();

export default class Root extends Component {
  render() {
    return(
      <Provider store={store}>
        <App />
      </Provider>
    )
  }
}

import React, { Component, PropTypes } from 'react';
import {render} from 'react-dom';
import { connect } from 'react-redux';
import { fetchFixtures } from '../actions';

const mapStateToProps = (state) => {
  return {
    fixtures: state.app.fixtures
  }
}

class App extends Component {
  constructor(props) {
    super(props);
  }

  componentDidMount() {
    const { dispatch, selectedSubreddit } = this.props;
  }

  render() {
    return(
      <div></div>
    )
  }
}

export default connect(mapStateToProps)(App);

import {createStore} from 'redux';
import Reducer from './reducers';

let initialState = {
  app: {
    teams: [],
    fixtures: [],
    manifesto: []
  }
}

export default function configureStore(initialState) {
  return createStore(
    Reducer,
    initialState
  )
}

export function fetchFixtures(url) {
  return fetch(url)
    .then(res => res.json())
    .then(json => dispatch(recieveFixtures(json)))
    .catch((err) => {
      console.log(err);
    });
}

function recieveFixtures(json) {
  return {
    type: ADD_FIXTURES,
    fixtures: json.fixtures.map(fixture => fixture)
  }
}

function euroSweep(state, action) {
  switch (action.type) {
    case 'ADD_FIXTURES':
      let newState = Object.assign({}, state);
      return newState;
    default:
      return state;
  }
}

export default euroSweep;

import React, {Component} from 'react';
import {render} from 'react-dom';
import Root from './containers/root';

render(
  <Root />, document.querySelector('.app')
)

reducers.js

import React, { Component } from 'react';
import { Provider } from 'react-redux';
import configureStore from '../configureStore';
import App from './app';

const store = configureStore();

export default class Root extends Component {
  render() {
    return(
      <Provider store={store}>
        <App />
      </Provider>
    )
  }
}

import React, { Component, PropTypes } from 'react';
import {render} from 'react-dom';
import { connect } from 'react-redux';
import { fetchFixtures } from '../actions';

const mapStateToProps = (state) => {
  return {
    fixtures: state.app.fixtures
  }
}

class App extends Component {
  constructor(props) {
    super(props);
  }

  componentDidMount() {
    const { dispatch, selectedSubreddit } = this.props;
  }

  render() {
    return(
      <div></div>
    )
  }
}

export default connect(mapStateToProps)(App);

import {createStore} from 'redux';
import Reducer from './reducers';

let initialState = {
  app: {
    teams: [],
    fixtures: [],
    manifesto: []
  }
}

export default function configureStore(initialState) {
  return createStore(
    Reducer,
    initialState
  )
}

export function fetchFixtures(url) {
  return fetch(url)
    .then(res => res.json())
    .then(json => dispatch(recieveFixtures(json)))
    .catch((err) => {
      console.log(err);
    });
}

function recieveFixtures(json) {
  return {
    type: ADD_FIXTURES,
    fixtures: json.fixtures.map(fixture => fixture)
  }
}

function euroSweep(state, action) {
  switch (action.type) {
    case 'ADD_FIXTURES':
      let newState = Object.assign({}, state);
      return newState;
    default:
      return state;
  }
}

export default euroSweep;

import React, {Component} from 'react';
import {render} from 'react-dom';
import Root from './containers/root';

render(
  <Root />, document.querySelector('.app')
)

index.js

import React, { Component } from 'react';
import { Provider } from 'react-redux';
import configureStore from '../configureStore';
import App from './app';

const store = configureStore();

export default class Root extends Component {
  render() {
    return(
      <Provider store={store}>
        <App />
      </Provider>
    )
  }
}

import React, { Component, PropTypes } from 'react';
import {render} from 'react-dom';
import { connect } from 'react-redux';
import { fetchFixtures } from '../actions';

const mapStateToProps = (state) => {
  return {
    fixtures: state.app.fixtures
  }
}

class App extends Component {
  constructor(props) {
    super(props);
  }

  componentDidMount() {
    const { dispatch, selectedSubreddit } = this.props;
  }

  render() {
    return(
      <div></div>
    )
  }
}

export default connect(mapStateToProps)(App);

import {createStore} from 'redux';
import Reducer from './reducers';

let initialState = {
  app: {
    teams: [],
    fixtures: [],
    manifesto: []
  }
}

export default function configureStore(initialState) {
  return createStore(
    Reducer,
    initialState
  )
}

export function fetchFixtures(url) {
  return fetch(url)
    .then(res => res.json())
    .then(json => dispatch(recieveFixtures(json)))
    .catch((err) => {
      console.log(err);
    });
}

function recieveFixtures(json) {
  return {
    type: ADD_FIXTURES,
    fixtures: json.fixtures.map(fixture => fixture)
  }
}

function euroSweep(state, action) {
  switch (action.type) {
    case 'ADD_FIXTURES':
      let newState = Object.assign({}, state);
      return newState;
    default:
      return state;
  }
}

export default euroSweep;

import React, {Component} from 'react';
import {render} from 'react-dom';
import Root from './containers/root';

render(
  <Root />, document.querySelector('.app')
)

import React，{Component}来自'React'；
从'react dom'导入{render}；
从“./containers/Root”导入根目录；
渲染(
，document.querySelector（“.app”）
)

哪里是

状态

未定义？在

mapstatetops

？@davintroon是，将状态传递给

mapstatetops

时，状态未定义

configureStore

看起来像什么？reducer正在生成的

夹具

？看起来您正在定义一个未考虑的

应用程序

密钥插入状态。尝试：fixtures:

state.app.fixtures

。看不到其他明显错误的内容。您的

初始状态

似乎未定义，因为您正在调用没有参数的

配置存储

。这将覆盖上部范围中的局部变量。指定默认参数或删除

configureStore

的参数。