javascript - Uncaught Error : Actions must be plain objects

Question

我已经遍历了所有带有此标题的问题，但找不到可以防止此错误的解决方案。到目前为止我已经尝试过的是确保我不会混淆新旧 redux api，我正在使用 babel 进行转译，所以没有适用的 typescript 解决方案，我已经确保我在相关操作中返回了一个函数，我已经注释掉我的导入或 thunk 以确保它中断，并且我在导入它后注销了 thunk 并且我得到了一个功能，并且我已经从 depricated 版本更新了 devtools 扩展。没有成功。任何帮助深表感谢。相关代码如下:

商店:

const redux = require('redux');
const {combineReducers, createStore, compose, applyMiddleware} = require('redux');
import {default as thunk} from 'redux-thunk';

const {nameReducer, hobbyReducer, movieReducer, mapReducer} = require('./../reducers/index');

export const configure = () => {

    const reducer = combineReducers({
        name: nameReducer,
        hobbies: hobbyReducer,
        movies: movieReducer,
        map: mapReducer
    });

    const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;

    const store = createStore(reducer, composeEnhancers(applyMiddleware(thunk)));   

    return store;
};

Action :

export let startLocationFetch = () => {type: 'START_LOCATION_FETCH'};

export let completeLocationFetch = (url) => {type: 'COMPLETE_LOCATION_FETCH', url};

export let fetchLocation = () => (dispatch, getState) => {
    dispatch(startLocationFetch());

    axios.get('http://ipinfo.io').then(function(res) {
        let loc = res.data.loc;
        let baseURL = 'http://maps.google.com?q=';

        dispatch(completeLocationFetch(baseURL + loc));
    });
};

调度 Action 的代码:

console.log('starting redux example');

const actions = require('./actions/index');
const store = require('./store/configureStore').configure();

let unsubscribe = store.subscribe(() => {
    let state = store.getState();

    if(state.map.isFetching){
        document.getElementById('app').innerHTML = 'Loading...';
    } else if(state.map.url){
        document.getElementById('app').innerHTML = '<a target=_blank href = "' + state.map.url + '">Location</a>';
    }
});



store.dispatch(actions.fetchLocation());

我现在正在学习 React/Redux(这是一门类(class))所以我真的可能遗漏了一些明显的东西。如果我遗漏了一些相关的内容，请告诉我。谢谢

Answer 1

export let startLocationFetch = () => {type: 'START_LOCATION_FETCH'};

不返回对象，而是应该导致语法错误。

要直接从箭头函数返回一个对象，需要设置括号，否则会被解释为一个 block :

export let startLocationFetch = () => ({type: 'START_LOCATION_FETCH'});

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编辑:感谢 Nicholas 指出这确实不是语法错误。