vuex的小demo

效果图：

vue的app.vue

<template>
  <div>
  <p>click {{count}} times,count is  {{evenOrOdd}}</p>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementIfOdd">odd</button>
    <button @click="incrementasync">async</button>
  </div>
</template>

<script>
   export  default {
       data(){
         return{
           count:0
         }
       },

     computed:{
       evenOrOdd(){
         return this.count%2===0 ? '偶数':"奇数"
       }
     },
     methods:{
       increment(){
           let count=this.count
           this.count= count+1
       },
       decrement(){
         let count=this.count
         this.count= count-1
       },
       //如果是奇数才增加
       incrementIfOdd(){
         let count=this.count
         if(count%2===1){
           this.count= count+1
         }
       },
       //过一秒才增加
       incrementasync(){
           setTimeout(()=>{
             let count=this.count
             this.count= count+1
           },1000)
       }
     }
   }
</script>

<style>

</style>

vuex的app.vue

<template>
  <div>
  <p>click {{$store.state.count}} times,count is  {{evenOrOdd}}</p>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementIfOdd">odd</button>
    <button @click="incrementasync">async</button>
  </div>
</template>

<script>
   export  default {
     computed:{
       evenOrOdd(){
         return this.$store.getters.evenOrOdd
       }
     },
     methods:{
       increment(){
         //通知vuex去增加
         this.$store.dispatch('increment')  //触发store中对应的action调用
       },
       decrement(){
         this.$store.dispatch('decrement')
       },
       //如果是奇数才增加
       incrementIfOdd(){
         this.$store.dispatch('incrementIfOdd')
       },
       //过一秒才增加
       incrementasync(){
         this.$store.dispatch('incrementasync')
       }
     }
   }
</script>

<style>

</style>

vuex的store.js

//vuex的核心管理对象模块
import Vue from 'vue'
import  Vuex from 'vuex'

Vue.use(Vuex)

//状态
const  state = {   //初始化状态
    count:0
}

//包含多个更新mutations函数的对象
const  mutations = {
    //增加的mutation
    INCREMENT(state){
      state.count++
    },
    //减少的mutation
   DECREMENT(state){
    state.count--
  }
}

//包含多个更新actions函数的对象
const  actions = {
  //增加action
  increment({commit}){
    commit("INCREMENT")
  },
  decrement({commit}){
    commit("DECREMENT")
  },
  incrementIfOdd({commit,state}){
    if(state.count%2===1){
      commit("INCREMENT")
    }
  },
  //异步的action
  incrementasync({commit}){
    setTimeout(()=>{
      commit("INCREMENT")
    },1000)
  }
}

//包含多个更新getters函数的对象
const  getters = {
      evenOrOdd(state){
        return state.count%2===0 ? '偶数':"奇数"
      }
}
export default new Vuex.Store({
  state,//状态
  mutations,//包含多个更新state函数的对象
  actions,//对应多个对应事件回调函数的对象
  getters // 包含多个getter计算属性函数的对象
})

vuex的main.js

// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from 'vue'
import App from './App'
import store from './store'

/* eslint-disable no-new */
new Vue({
  el: '#app',
  components: { App },
  template: '<App/>',
  store   //所有的组件对象都多了一个$store
})