vuex学习---modules

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

//使用vuex模块
Vue.use(Vuex);

//声明静态常量为4
const state = {
    count : 4
};

const mutations = {
    add(state,n){
        state.count +=n.a;
    },
    sub(state){
        state.count--;
    }
};

const actions = {
    //2种书写方式
    addplus(context){ //可以理解为代表了整个的context
        context.commit(‘add‘,{a:10}) 
    },
    subplus({commit}){
        commit(‘sub‘);
    }
};

//1定义模块组
var moduleA = {
     state,
    mutations,
    actions
};

//导出一个模块
export default new Vuex.Store({
  //2声明模块组  
  modules:{
       a:moduleA
  }
 //3在App.vue中调用
})

<template>
  <div id="app">
     <div id="appaaa">
        <h1>这是vuex的示例</h1>
         <p>{{$store.state.a.count}}</p>
        <p>
            <button @click = "addplus">+</button>
            <button @click = "subplus">-</button>
        </p>
        </p>

    </div>
  </div>
</template>

<script>
//引入mapGetters 
import {mapActions} from ‘vuex‘
export default {
  name:‘app‘,
 methods:{
     ...mapActions([
            "addplus",
            "subplus"
         ])
 }

}
</script>

<style>

</style>