1、

在src文件夹下创建：store文件=》configureStore.js，用来放置redux的启动代码。只要是返回一个store.

//整体的代码骨架:
import {
    createStore,
    applyMiddleware,
    combineReducers
} from 'redux'
import thunk from 'redux-thunk' 
// 引入reducer
import reducers from './reducers'

const rootReducers = combineReducers({
    ...reducers
})

const middleweares = applyMiddleware(thunk)

function configureStore(){ 
    return createStore(rootReducers,middleweares)
}

export default configureStore

2、拆分reducer到对应文件，不要都写在index.js
如：counterRedux.js下放置对应的reducer和action,导出reducer
注意：不要把所有action都放在同一文件下，将对应的action放置在对应的redux文件下，把所有的action都使用export导出去。

const INCREASE = 'INCREASE/rdx/magicNum'
const DECREASE = 'DECREASE/rdx/magicNum'
// 把所有的action放到一个对象中，最后需要导出这个对象
let actions = {
    increaseAction : (val)=>({
        type: INCREASE,
        val
    }),
    decreaseAction : (val)=>(dispatch,getState)=>{
        if(getState()-val >= 0){
            dispatch({
                type: DECREASE,
                val
            })
        }
    },
    increaseByOddAction : (val)=>(dispatch,getState)=>{
        if(getState()%2!==0){
            dispatch(increaseAction(val))
        }
    },
    increaseByAsyncAction : (val)=>(dispatch,getState)=>{
        setTimeout(()=>{
            dispatch(decreaseAction(val))
        },1000)
    }
}
export {actions}

export default function counter(state=0,action){
    let {type,val} = action

    switch (type) {
        case INCREASE : 
            return state+val
            break;
        case DECREASE : 
            return state-val
            break;
        default : 
            return state
    }
    return state 
}

3、组合reducers
引入需要的reducer

import counter from '../component/counterRedux'
import magicNum from '../component/magicNumRedux'

export default {
    counter,
    magicNum
}

屏幕快照 2018-06-14 上午12.40.37.png