在 react 项目里应用 immutable 对 redux 进行处理，对 List 数据渲染的问题

import { combineReducers } from ‘redux‘

import { fromJS } from ‘immutable‘

const defaultState = fromJS({
  hotCity: [],
  areas: [],
  city: ‘全国‘,
})

import { fromJS } from ‘immutable‘

import {
  GET_CITYINFO_DATA,
  CHANGE_CITY_DATA,
} from ‘./actionTypes‘

const defaultState = fromJS({
  hotCity: [],
  areas: [],
  city: ‘全国‘,
})

export default (state=defaultState,action) => {
  if(action.type === GET_CITYINFO_DATA){
    // return {
    //   ...state,
    //   hotCity: [...action.result.hotCity],
    //   areas: [...action.result.areas]
    // }
    let newList = state.setIn([‘hotCity‘],fromJS(action.result.hotCity))
    return newList.setIn([‘areas‘],fromJS(action.result.areas))
    //如果要再原来的基础上修改List数据，就要用 updataIn方法如下 插入两个 List
    // let newList = newProjectInfo.updateIn([‘projectInfo‘],list => list.concat(fromJS(action.result.loadMore),fromJS(action.result.loadMore)))
  }
  if(action.type === CHANGE_CITY_DATA){
    // return {
    //   ...state,
    //   city: action.city
    // }
    return state.setIn([‘city‘],action.city)
  }
  return state
}

export const GET_CITYINFO_DATA = ‘address/get_cityInfo_data‘

import {connect} from ‘react-redux‘

import {CHANGE_CITY_DATA} from ‘pages/address/actionTypes‘

const mapState = (state) => {
  return {
    hotCity: state.getIn([‘address‘,‘hotCity‘]),
    areas: state.getIn([‘address‘,‘areas‘]),
  }
}
const mapDispatch = (dispatch) => {
  return {
    loadData () {
      dispatch(loadListAsync(dispatch))
    },
    changeCity (city) {
      dispatch({
        type: CHANGE_CITY_DATA,
        city
      })
    }
  }
}

import {
  GET_CITYINFO_DATA,
} from ‘./actionTypes‘

export const loadCityInfoAsync = (result) => {
  return {
    type: GET_CITYINFO_DATA,
    result
  }
}

export const loadListAsync = (dispatch) => {
  return () => {
    fetch(‘/api/position/city‘)
      .then(response => response.json())
      .then(result => {
        dispatch(loadCityInfoAsync(result))
      })
  }
}

import React,{Component} from ‘react‘
import {connect} from ‘react-redux‘
import BScroll from ‘better-scroll‘

import {AddressContainer} from ‘./styledComponents‘
import {loadListAsync} from ‘pages/address/actionCreator‘
import {CHANGE_CITY_DATA} from ‘pages/address/actionTypes‘

const mapState = (state) => {
  return {
    hotCity: state.getIn([‘address‘,‘hotCity‘]),
    areas: state.getIn([‘address‘,‘areas‘]),
  }
}
const mapDispatch = (dispatch) => {
  return {
    //请求数据
    loadData () {
      dispatch(loadListAsync(dispatch))
    },
    //改变redux中所保存的城市信息
    changeCity (city) {
      dispatch({
        type: CHANGE_CITY_DATA,
        city
      })
    }
  }
}

class AddressContent extends Component {
  render(){
    // 将 this.props 内的内容解构出来
    let { hotCity, areas, changeCity, handleClick } = this.props
    //为在一页显示就没有进一步拆分，看不惯还请见谅
    return (
      // 绑定 better-scroll 的滚动根元素
      <AddressContainer className="address-com-page" ref={el => this.scrollEl = el}>
        <div>
          <div>
            <div className="address-tit">定位城市</div>
            <div className="address-hot">
              <span>定位失败</span>
            </div>
          </div>
          <div>
            <div className="address-tit" ref="hot">热门城市/区域</div>
            <div className="address-hot">
              {
                // 对 hotCity 进行渲染，先判断这个数据是否存在，存在再渲染
                // 数据是一个 List ,里面是个 Map , 里面的 cities 的值 是一个 List 类型，取得后直接进行map()
                hotCity.get(0) && hotCity.getIn([0,‘cities‘]).map((v,i) => {
                  return (
                    // 绑定点击事件，选取所点击的城市 changeCity()
                    // handleClick() 是路由跳转，跳回首页
                    // cities 的每个子元素都是 Map ,利用 get() 来获取值
                    <span key={ v.get(‘cityId‘) }
                    onClick={() => {
                      changeCity(v.get(‘name‘))
                      handleClick()
                    }} >
                    { v.get(‘name‘) }</span>
                  )
                })
              }
            </div>
          </div>
          <div>
            {
              // 对按字母顺序排列的城市列表进行渲染
              areas.map((v,i) => {
                return (
                  <div key={v.get(‘prefix‘)}>
                    {/* 将小写字母转为大写 */}
                    <div className="address-tit">{ v.get(‘prefix‘).toUpperCase() }</div>
                    <ul className="address-detail">
                      {
                        // 渲染城市列表，并绑定点击事件
                        v.get(‘cities‘).map((v,i) => {
                          return (
                            <li key={v.get(‘cityId‘)}
                              onClick={() => {
                                changeCity(v.get(‘name‘))
                                handleClick()
                            }}>{ v.get(‘name‘) }</li>
                          )
                        })
                      }                      
                    </ul>
                  </div>
                )
              })
            }
          </div>
        </div>
      </AddressContainer>
    )
  }
  componentDidMount(){
    // 调用 mapDispatch 中的loadData() 方法，获取数据
    this.props.loadData()

    this.bScroll = new BScroll(this.scrollEl,{
      click: true,
    })
  }
}

export default connect(mapState,mapDispatch)(AddressContent)