4.vuex学习之getters、mapGetters

import Vue from ‘vue‘
import Vuex from ‘vuex‘

Vue.use(Vuex)

//访问状态对象
const state = {
    count:1
}

const getters = {
    //vue2.0不要使用箭头函数,getters主要任务就是对状态state对象里面的数据，执行计算后输出
    count:function(state){
            return state.count+=100
    }
}
export default new Vuex.Store({
    state,
    getters
})

<template>
  <div id="app">
    
    <img src="./assets/logo.png">
    <h1>{{ msg}}</h1>
    <!--访问状态对象-->
    <div>{{$store.state.count}}</div>
    
    <!--getters中获取到的-->
    <p>{{count}}</p>
  </div>
</template>

<script>

//vuex提供的辅助函数
import {mapState,mapMutations,mapGetters,mapActions} from ‘vuex‘
export default {
  name: ‘app‘,
  data () {
    return {
      msg: ‘Welcome to Your Vue.js App‘
    }
  },
 computed:{
   count(){
     return this.$store.getters.count
   },
  // ...mapGetters([//使用mapGetters简写
  //   ‘count‘
  // ])
 }
}
</script>

<style>
#app {
  font-family: ‘Avenir‘, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}

h1, h2 {
  font-weight: normal;
}

ul {
  list-style-type: none;
  padding: 0;
}

li {
  display: inline-block;
  margin: 0 10px;
}

a {
  color: #42b983;
}
</style>