cnpm i vuex -S 

const state = {
  userInfo: {
    userName: '秋刀魚笛滋味',
    age: 28,
    job: '前端工程師'
  },
  firend: [],
  girlfirend: [
    {
      name: 'LuoSi',
      age: 20,
      nationality: '韓國'
    },
    {
      name: 'AnNi',
      age: 22,
      nationality: '俄羅斯'
    }
  ]
}
export default state;

const getters = {
  userJob: (state) => {
    return `${state.userInfo.job}`
  },
  girlfirendInfo: (state, getters) => {
    const girlfirend = state.girlfirend
    let info = girlfirend.map((item, index) => {
      return `${index + 1}號女友的名字是${item.name}，年齡${item.age}，來自${item.nationality}`
    }).join('，')
    return `一共有${girlfirend.length}個女友,${info},可怕的是他只是一名${getters.userJob}。`
  }
}
export default getters;

import axios from 'axios';
const mutations = {
  ageAdd (state, payload) {
    payload = payload || 1
    state.userInfo.age += payload
  },
  addGirlFirend (state, payload) {
    state.girlfirend.push({ name: payload.name, age: payload.age, nationality: payload.nationality })
  },
  getFirend (state, payload) {
    state.firend = payload
  },
  mutfired (state) { //vuex嚴禁在mutations里面進行異步操作，嚴格模式報錯，難于調試
    axios.get('/myServer').then(res => {
      if (res.status === 200) {
        state.firend = res.data.data.list
      }
    })
  }
}
export default mutations;

import axios from 'axios';
const actions = {
  addGirlFirend ({ commit, state, getters }, payload) {
    commit('addGirlFirend', payload);
  },
  getFirends (ctx) { //ctx是store下當前module對象
    axios.get('/myServer').then(res => {
      if (res.status === 200) {
        ctx.commit('getFirend', res.data.data.list)
        //直接在actions里面也可以修改state，但是不建議，創(chuàng)建store時用嚴格模式，會報錯，不符合vuex單向數(shù)據(jù)流的規(guī)范（只能在mutions里面修改state）
        // ctx.state.firend = res.data.data.list
      }
    })
  }
}
export default actions;

import state from './state';
import getters from './getters';
import mutations from './mutations.js';
import actions from './actions';
const moduleA = {
  state,
  getters,
  mutations,
  actions
}
export default moduleA;

import Vuex from 'vuex'
import Vue from 'vue'
import moduleA from './moduleA';
import moduleB from './moduleB';
Vue.use(Vuex)
let store = new Vuex.Store({
  //在嚴格模式下，無論何時發(fā)生了狀態(tài)變更且不是由 mutation 函數(shù)引起的，將會拋出錯誤。這能保證所有的狀態(tài)變更都能被調試工具跟蹤到。
  //*嚴格模式會深度監(jiān)測狀態(tài)樹來檢測不合規(guī)的狀態(tài)變更——請確保在發(fā)布環(huán)境下關閉嚴格模式，以避免性能損失。
  strict: process.env.NODE_ENV !== 'production',//自動在生產(chǎn)環(huán)境下關閉嚴格模式
  modules: {
    moduleA,
    moduleB
  }
})
export default store

new Vue({
  el: '#app',
  router,
  store,
  components: { App },
  template: '<App/>'
})

<template>
  <div>
    <Card style="width:550px">
      <div slot="title">
        <Icon type="ios-film-outline"></Icon>
        個人信息
      </div>
      <div>
        <p>姓名： {{userInfo.userName}}</p>
        <p>年齡： {{userInfo.age}}</p>
        {{girlfirendInfo}}
      </div>
    </Card>
    <hr style="margin:20px 0" />
    <Button type="success" @click="ageAdd()">增加了一歲</Button>
    <hr style="margin:20px 0" />
    <Button type="success" @click="addAge">增加了兩歲(commit)</Button>
    <hr style="margin:20px 0" />
    <Card style="width:550px">
      <div slot="title">
        <Icon type="ios-film-outline"></Icon>
        女友信息：
      </div>
      <div>
        名字：
        <Input v-model="girlInfo.name"></Input>
        年齡：</br>
        <Input-number :max="100" :min="1" v-model="girlInfo.age"></Input-number></br>
        國籍：
        <Input v-model="girlInfo.nationality"></Input>
      </div>
      <Button type="success" @click="addGirlFirend(girlInfo)">增加</Button>
      <Button type="success" @click="addGirlFirend1">增加(dispatch)</Button>
    </Card>
    <hr style="margin:20px 0" />
    <Card style="width:550px">
      <div slot="title">
        <Icon type="ios-film-outline"></Icon>
        朋友信息：
      </div>
      <div>
        <p v-for="item in firend" :key="item.userName">{{item.userName}}</p>
      </div>
      <Button type="info" @click="getFirends">獲取朋友</Button>
    </Card>
  </div>
</template>
<script>
import { mapState, mapGetters, mapMutations, mapActions } from 'vuex'
export default {
  data () {
    return {
      girlInfo: {
        name: '',
        age: 18,
        nationality: ''
      }
    }
  },
  computed: {
    ...mapGetters(['girlfirendInfo']),
    ...mapState({
      userInfo: state => state.moduleA.userInfo, //使用vuex的modules后一定要指明模塊
      firend: state => state.moduleA.firend
    })
  },
  methods: {
    ...mapActions(['addGirlFirend', 'getFirends']), //this.$store.dispatch('addGirlFirend',payload)
    ...mapMutations(['ageAdd']), //this.$store.commit('ageAdd',payload)
    // 上面兩個輔助函數(shù)方法的實質跟下面是一樣的，推薦 使用輔助函數(shù)
    addAge () {
      this.$store.commit('ageAdd', 2)
    },
    addGirlFirend1 () {
      this.$store.dispatch('addGirlFirend', this.girlInfo)
    }
  }
}