商店没有一个有效的减速

actions.js

export const UPDATE = "UPDATE";

utils.js

export default function createReducer(initialState, handlers) { 
    return function reducer(state = initialState, action) { 
     if (handlers.hasOwnProperty(action.type)) { 
      return handlers[action.type](state, action) 
     } else { 
      return state 
     } 
    } 
}

减速。 js

import createReducer from "../../lib/utils.js"; 
import * as actions from "./actions.js"; 

export const filter = createReducer({}, { 

});

个

combinedReducers.js

import { 
    combineReducers 
} from "redux"; 
import filter from "../container/filter/reducer.js"; 

export default combineReducers(Object.assign(
    filter, 
));

而且多数民众赞成在我尝试挂钩的store。

index.android.js

import React, { Component } from "react"; 
import { 
    AppRegistry, 
} from "react-native"; 
import { 
    Provider 
} from "react-redux"; 
import { 
    createStore, 
    applyMiddleware, 
    compose, 
} from "redux"; 
import { 
    createLogger, 
} from "redux-logger"; 
import reducer from "./src/lib/reducers.js"; 
import thunkMiddleware from "redux-thunk"; 
import App from "./src/config/App.js" 

const loggerMiddleware = createLogger({ predicate: (getState, action) => __DEV__}); 

function configureStore(initialState) { 
    const enhancer = compose(
    applyMiddleware(
     thunkMiddleware, 
     loggerMiddleware, 
    ), 
); 
    return createStore(reducer, initialState, enhancer); 
} 

const store = configureStore({}); 

const HelloWorld =() => { 
    <Provider store={store}> 
    <App/> 
    </Provider> 
} 
AppRegistry.registerComponent("...",() => HelloWorld);

，我总是得到：

商店没有一个有效的减速确保传递给combineReducers参数是一个对象，其值减速。

我在这做错了什么？我认为它的createReducer()函数？！

来源

2017-10-06 Stophface

的问题是在这里：

export default combineReducers(Object.assign(
    filter, 
));

filter返回函数和Object.assign返回了功能，combineReducers期待的对象，每关键是减速机。

所以，你的代码应该是这样的：

export default combineReducers(Object.assign({ filter }));

或

export default combineReducers({ filter });

来源

2017-10-06 16:51:19 Jalissa

似乎是在

export default combineReducers(Object.assign, { 
    filter, 
});

一个错字，因为Object.assign没有参数。

来源

2017-10-06 15:16:38 JulienD

你是对的。但是，如果我这样写'export default combineReducers（Object.assign（ filter，））;'我仍然得到错误。 – Stophface

您在评论中刚写下的内容中还有一个错字。你的意思是'export default combineReducers（Object.assign（filter，{}））;'？ 'Object.assign'接受两个对象作为参数。 – JulienD

我也试过了。同样的错误。 – Stophface

这是我减速的一个例子细分

//reducers/index.js 
import { combineReducers } from 'redux'; 
import MyReducer from "./MyReducer"; 

const rootReducer = combineReducers({  
myProp: MyReducer 
}); 

export default rootReducer; 


//reducer/MyReducer.js 
export default function MyReducer (state = null, action) { 
    switch (action.type) { 
     case 'MY_ACTION_TYPE': 
      return action.payload 
    } 
    return state; 
}

来源

2017-10-06 16:26:40 artSir

商店没有一个有效的减速

回答

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