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Vuex的各个模块封装
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;
作者：Vam的金豆之路
主要领域：前端开发
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