Vuex的各个模块封装的实现

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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

import Vue from 'vue'
import Vuex from 'vuex'
import * as actions from './actions'
import * as getters from './getters'
import state from './state'
import mutations from './mutations'
import createLogger from 'vuex/dist/logger' // vuex调试工具

Vue.use(Vuex)

const debug = process.env.NODE_ENV !== 'prodycution' // 开发环境下开启严格模式

export default new Vuex.Store({
 actions,
 getters,
 state,
 mutations,
 strict: debug,
 plugins: debug ? [createLogger()] : [] 
})

state.js

import {playMode} from 'common/js/config'
import {loadSearch} from 'common/js/cache'

const state = {
 singer: {},
 playing: false,
 fullScreen: false,
 playlist: [],
 sequenceList: [],
 mode: playMode.sequence,
 currentIndex: -1,
 disc: {},
 topList: {},
 searchHistory: loadSearch()
}

export default state

mutations.js

import * as types from './mutation-types'

const mutations = {
 [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
 }
}

export default mutations

mutation-types.js

export const SET_SINGER = 'SET_SINGER'

export const SET_PLAYING_STATE = 'SET_PLAYING_STATE'

export const SET_FULL_SCREEN = 'SET_FULL_SCREEN'

export const SET_PLAYLIST = 'SET_PLAYLIST'

export const SET_SEQUENCE_LIST = 'SET_SEQUENCE_LIST'

export const SET_PLAY_MODE = 'SET_PLAY_MODE'

export const SET_CURRENT_INDEX = 'SET_CURRENT_INDEX'

export const SET_DISC = 'SET_DISC'

export const SET_TOP_LIST = 'SET_TOP_LIST'

export const SET_SEARCH_HISTORY = 'SET_SEARCH_HISTORY'

getters.js

export const singer = state => state.singer

export const playing = state => state.playing

export const fullScreen = state => state.fullScreen

export const playlist = state => state.playlist

export const sequenceList = state => state.sequenceList

export const mode = state => state.mode

export const currentIndex = state => state.currentIndex

export const currentSong = (state) => {
 return state.playlist[state.currentIndex] || {}
}

export const disc = state => state.disc

export const topList = state => state.topList

export const searchHistory = state => state.searchHistory

actions.js

import * as types from './mutation-types'
import {playMode} from 'common/js/config'
import {shuffle} from 'common/js/util'
import {saveSearch, deleteSearch, clearSearch} from 'common/js/cache'


function findIndex(list, song) {
 return list.findIndex((item) => {
 return item.id === song.id
 })
}

export const selectPlay = function ({commit, state}, {list, index}) {
 commit(types.SET_SEQUENCE_LIST, list)
 if (state.mode === playMode.random) {
 let randomList = 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)
}

export const randomPlay = function({commit}, {list}) {
 commit(types.SET_PLAY_MODE, playMode.random)
 commit(types.SET_SEQUENCE_LIST, list)
 let randomList = 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)
}

export const insertSong = function({commit, state}, song) {
 let playlist = state.playlist.slice()
 let sequenceList = state.sequenceList.slice()
 let currentIndex = state.currentIndex
 // 记录当前歌曲
 let currentSong = playlist[currentIndex]

 // 查找当前列表中是否有待插入的歌曲并返回其索引
 let fpIndex = 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)
 }
 }

 let currentSIndex = findIndex(sequenceList, currentSong) + 1

 let fsIndex = 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)
}

export const saveSearchHistory = function({commit}, query) {
 commit(types.SET_SEARCH_HISTORY, saveSearch(query))
}

export const deleteSearchHistory = function({commit}, query) {
 commit(types.SET_SEARCH_HISTORY, deleteSearch(query))
}

export const clearSeachHistory = function({commit}) {
 commit(types.SET_SEARCH_HISTORY, clearSearch())
}

小贴士：

默认接口: export default
具名接口: export

1、export导出多个对象，export default只能导出一个对象。

2、export导出对象需要用{ }，export default不需要{ }。

3、在其他文件引用export default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 * as someIdentifier from "someModule";
***************************************
export { es6 as default } from './someModule';
// 等同于
import { es6 } from './someModule';
export default es6;

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