combineReducers 对数据进行拆分管以及使用immutable.js

1 使用combineReaducers 整合reducers

import { combineReducers } from 'redux-immutable';
import { reducer as headerReducer } from '../common/header/store';
import { reducer as homeReducer } from '../pages/home/store';
import { reducer as detailReducer } from '../pages/detail/store';
import { reducer as loginReducer } from '../pages/login/store';

const reducer = combineReducers({
    header: headerReducer, //对应的state保存在 header下
    home: homeReducer,
    detail: detailReducer,
    login: loginReducer
});

export default reducer;

2. 在store文件夹下建立index文件，把该文件夹下的内容，全部用index文件发出去：

import reducer from './reducer';
import * as actionCreators from './actionCreators';
import * as constants from './constants';

export { reducer, actionCreators, constants };

3 对应的获取数据也要多一层：

const mapStateToprops = (state)=>{
    return {
        focused: state.header.focused
    }
}

4. 使用immutable来改变state：先安装immutable（用在reducer中）

    安装redux-immutable，在最外层的reducer中，将其中的state也变为immutable对象，

import { combineReducers } from 'redux-immutable';

import * as constants from './constants';
import { fromJS } from 'immutable'; //这里引入immutable

const defaultState = fromJS({ //这里用fromJs将js对象改为immutable对象
    focused: false,
    mouseIn: false,
    list: [],
    page: 1,
    totalPage: 1
});

export default (state = defaultState, action) => {
    switch(action.type) {
        case constants.SEARCH_FOCUS:
            return state.set('focused', true); //使用set改变数据，immutable对象的set方法，会结合之前immutable对象的值和设置的值，返回一个全新的对象
        case constants.SEARCH_BLUR:
            return state.set('focused', false);
        case constants.CHANGE_LIST:
            return state.merge({ //改变多个数据
                list: action.data,
                totalPage: action.totalPage
            });
        case constants.MOUSE_ENTER:
            return state.set('mouseIn', true);
        case constants.MOUSE_LEAVE:
            return state.set('mouseIn', false);
        case constants.CHANGE_PAGE:
            return state.set('page', action.page);
        default:
            return state;
    }
}

获取单个immutable对象：（当没有引入redux-immutable的时候 state是从最外层的reducer而来，还是普通的js对象）

const mapStateToprops = (state)=>{
    return {
        focused: state.header.get('focused')
    }
}

在组件中需要把immutable对象再改变回正常的js对象：（这种方法是引入看redux-immutable，然后在最外层的reducer中把state改成来 immutable对象，所以state可以使用getIn函数了，获取header的reducer下的focused）

const mapStateToProps = (state) => {
    return {
        focused: state.getIn(['header', 'focused']),
        login: state.getIn(['login', 'login'])
    }
}

 5 使用axios异步获取数据，放在 actioncreater中：

import * as constants from './constants';
import { fromJS } from 'immutable';
import axios from 'axios';

const changeList = (data) => ({
    type: constants.CHANGE_LIST,
    data: fromJS(data),
    totalPage: Math.ceil(data.length / 10)
});

export const getList = () => {
    return (dispatch) => {
        axios.get('/api/headerList.json').then((res) => {
            const data = res.data;
            dispatch(changeList(data.data)); //dispatch 使用了本文件中的函数，该函数不再对外
        }).catch(() => {
            console.log('error');
        })
    }
};

 则前面组件调用方式为：

dispatch(actionCreators.getList());

因为有多个reducer 则对应的多个actionCreators，每个小store中 使用index 提供对外接口：
import { actionCreators } from './store';