npm install vuex --save

import Vue from 'vue';
import Vuex from 'vuex';

Vue.use(Vuex);

import storeConfig from './vuex/store'

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

import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

const store = new Vuex.Store({
 state: {
 count: 0,
 show: ''
 },
 getters: {
 counts: (state) => {
  return state.count
 }
 },
 mutations: {
 increment: (state) => {
  state.count++
 },
 decrement: (state) => {
  state.count--
 },
 changTxt: (state, v) => {
  state.show = v
 }
 }
})

export default store

handleIncrement () {
  this.$store.commit('increment')
 }

changObj () {
  this.$store.commit('changTxt', this.obj)
 }

changObj () {
  this.$store.commit('changTxt', {
   key:''
  })
 }

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

<template>
<div class="store">
 <p>
 {{$store.state.count}}
 </p>
 <el-button @click="handleIncrement"><strong>+</strong></el-button>
 <el-button @click="handleDecrement"><strong>-</strong></el-button>
 <hr>
 <h3>{{$store.state.show}}</h3>
 <el-input
 placeholder="请输入内容"
 v-model="obj"
 @change="changObj"
 clearable>
 </el-input>
</div>
</template>
<script>
export default {
 data () {
 return {
  obj: ''
 }
 },
 methods: {
 handleIncrement () {
  this.$store.commit('increment')
 },
 handleDecrement () {
  this.$store.commit('decrement')
 },
 changObj () {
  this.$store.commit('changTxt', this.obj)
 }
 }
}
</script>