es6导入，导出默认，

Question

https://github.com/rt2zz/redux-persist显示以下代码片段

const persistedReducer = persistReducer(persistConfig, rootReducer)

export default () => {

  let store = createStore(persistedReducer)

  let persistor = persistStore(store)

  return { store, persistor }

}

您可以改为这样做，两者之间有什么区别？

const persistedReducer = persistReducer(persistConfig, rootReducer)

let store = createStore(persistedReducer)

let persistor = persistStore(store)

export { store, persistor }

编辑

更重要的是，为什么要使用第一种形式而不是第二种形式？

Answer 1

第一个片段是导出 a function，它返回 a object。第二个片段直接返回 a object。导入第一个片段时，您需要调用该函数来获取对象。同时您可以直接从第二个片段导入对象。

Answer 2

vi a.mjs然后写：export default () => {  let store = 'createStore';  let persistor = 'persistStore';  return { store, persistor }}let store = 'createStore';let persistor = 'persistStore';export { store, persistor }vi b.mjs然后写：import a from './a.mjs';import * as $a from './a.mjs';import { store, persistor } from './a.mjs';console.log('export default function:', a);console.log('export object:', $a);console.log('export object.default:', $a.default);console.log('export { store, persistor }:', store, persistor);node  --experimental-modules b.mjs你会得到这样的结果：export default function: [Function: default]export object: [Module] {  default: [Function: default],  persistor: 'persistStore',  store: 'createStore'}export object.default: [Function: default]export { store, persistor }: createStore persistStore