Vuex的各个模块封装的实现
一、各个模块的作用:
- state用来数据共享数据存储
- mutation用来注册改变数据状态(同步)
- getters用来对共享数据进行过滤并计数操作
- action解决异步改变共享数据(异步)
二、创建文件:
- actions.js
- getters.js
- index.js
- mutations.js
- mutation-types.js
- state.js
三、编辑文件
这里只是拿出自己的项目来做一个例子,只是介绍封装的方法。
index.js
importVuefrom'vue' importVuexfrom'vuex' import*asactionsfrom'./actions' import*asgettersfrom'./getters' importstatefrom'./state' importmutationsfrom'./mutations' importcreateLoggerfrom'vuex/dist/logger'//vuex调试工具 Vue.use(Vuex) constdebug=process.env.NODE_ENV!=='prodycution'//开发环境下开启严格模式 exportdefaultnewVuex.Store({ actions, getters, state, mutations, strict:debug, plugins:debug?[createLogger()]:[] })
state.js
import{playMode}from'common/js/config' import{loadSearch}from'common/js/cache' conststate={ singer:{}, playing:false, fullScreen:false, playlist:[], sequenceList:[], mode:playMode.sequence, currentIndex:-1, disc:{}, topList:{}, searchHistory:loadSearch() } exportdefaultstate
mutations.js
import*astypesfrom'./mutation-types' constmutations={ [types.SET_SINGER](state,singer){ state.singer=singer }, [types.SET_PLAYING_STATE](state,flag){ state.playing=flag }, [types.SET_FULL_SCREEN](state,flag){ state.fullScreen=flag }, [types.SET_PLAYLIST](state,list){ state.playlist=list }, [types.SET_SEQUENCE_LIST](state,list){ state.sequenceList=list }, [types.SET_PLAY_MODE](state,mode){ state.mode=mode }, [types.SET_CURRENT_INDEX](state,index){ state.currentIndex=index }, [types.SET_DISC](state,disc){ state.disc=disc }, [types.SET_TOP_LIST](state,topList){ state.topList=topList }, [types.SET_SEARCH_HISTORY](state,history){ state.searchHistory=history } } exportdefaultmutations
mutation-types.js
exportconstSET_SINGER='SET_SINGER' exportconstSET_PLAYING_STATE='SET_PLAYING_STATE' exportconstSET_FULL_SCREEN='SET_FULL_SCREEN' exportconstSET_PLAYLIST='SET_PLAYLIST' exportconstSET_SEQUENCE_LIST='SET_SEQUENCE_LIST' exportconstSET_PLAY_MODE='SET_PLAY_MODE' exportconstSET_CURRENT_INDEX='SET_CURRENT_INDEX' exportconstSET_DISC='SET_DISC' exportconstSET_TOP_LIST='SET_TOP_LIST' exportconstSET_SEARCH_HISTORY='SET_SEARCH_HISTORY'
getters.js
exportconstsinger=state=>state.singer exportconstplaying=state=>state.playing exportconstfullScreen=state=>state.fullScreen exportconstplaylist=state=>state.playlist exportconstsequenceList=state=>state.sequenceList exportconstmode=state=>state.mode exportconstcurrentIndex=state=>state.currentIndex exportconstcurrentSong=(state)=>{ returnstate.playlist[state.currentIndex]||{} } exportconstdisc=state=>state.disc exportconsttopList=state=>state.topList exportconstsearchHistory=state=>state.searchHistory
actions.js
import*astypesfrom'./mutation-types' import{playMode}from'common/js/config' import{shuffle}from'common/js/util' import{saveSearch,deleteSearch,clearSearch}from'common/js/cache' functionfindIndex(list,song){ returnlist.findIndex((item)=>{ returnitem.id===song.id }) } exportconstselectPlay=function({commit,state},{list,index}){ commit(types.SET_SEQUENCE_LIST,list) if(state.mode===playMode.random){ letrandomList=shuffle(list) commit(types.SET_PLAYLIST,randomList) index=findIndex(randomList,list[index]) }else{ commit(types.SET_PLAYLIST,list) } commit(types.SET_CURRENT_INDEX,index) commit(types.SET_FULL_SCREEN,true) commit(types.SET_PLAYING_STATE,true) } exportconstrandomPlay=function({commit},{list}){ commit(types.SET_PLAY_MODE,playMode.random) commit(types.SET_SEQUENCE_LIST,list) letrandomList=shuffle(list) commit(types.SET_PLAYLIST,randomList) commit(types.SET_CURRENT_INDEX,0) commit(types.SET_FULL_SCREEN,true) commit(types.SET_PLAYING_STATE,true) } exportconstinsertSong=function({commit,state},song){ letplaylist=state.playlist.slice() letsequenceList=state.sequenceList.slice() letcurrentIndex=state.currentIndex //记录当前歌曲 letcurrentSong=playlist[currentIndex] //查找当前列表中是否有待插入的歌曲并返回其索引 letfpIndex=findIndex(playlist,song) //因为是插入歌曲,所以索引要+1 currentIndex++ //插入这首歌到当前索引位置 playlist.splice(currentIndex,0,song) //如果已经包含这首歌 if(fpIndex>-1){ //如果当前插入的序号大于列表中的序号 if(currentIndex>fpIndex){ playlist.splice(fpIndex,1) currentIndex-- }else{ playlist.splice(fpIndex+1,1) } } letcurrentSIndex=findIndex(sequenceList,currentSong)+1 letfsIndex=findIndex(sequenceList,song) sequenceList.splice(currentSIndex,0,song) if(fsIndex>-1){ if(currentSIndex>fsIndex){ sequenceList.splice(fsIndex,1) }else{ sequenceList.splice(fsIndex+1,1) } } commit(types.SET_PLAYLIST,playlist) commit(types.SET_SEQUENCE_LIST,sequenceList) commit(types.SET_CURRENT_INDEX,currentIndex) commit(types.SET_FULL_SCREEN,true) commit(types.SET_PLAYING_STATE,true) } exportconstsaveSearchHistory=function({commit},query){ commit(types.SET_SEARCH_HISTORY,saveSearch(query)) } exportconstdeleteSearchHistory=function({commit},query){ commit(types.SET_SEARCH_HISTORY,deleteSearch(query)) } exportconstclearSeachHistory=function({commit}){ commit(types.SET_SEARCH_HISTORY,clearSearch()) }
小贴士:
默认接口:exportdefault
具名接口:export
1、export导出多个对象,exportdefault只能导出一个对象。
2、export导出对象需要用{},exportdefault不需要{}。
3、在其他文件引用exportdefault导出的对象时不一定使用导出时的名字。因为这种方式实际上是将该导出对象设置为默认导出对象。
4、导入和导出都可以使用as重新命名,as前为原来的名字,后为定义后的名字。
举例:
import*assomeIdentifierfrom"someModule"; *************************************** export{es6asdefault}from'./someModule'; //等同于 import{es6}from'./someModule'; exportdefaultes6;
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