最简单新手vuex案例（二、mutations对象）

功能：每次+10或-10

state文件中的index.js

 1 import Vue from 'vue'
 2 import Vuex from 'vuex'
 3 
 4 Vue.use(Vuex)
 5 
 6 const state = {
 7     num: 0
 8 }
 9 
10 const mutations = {
11     mutationsAddCount(state, n = 0) {
12         return (state.num += n)
13     },
14     mutationsReduceCount(state, n = 0) {
15         return (state.num -= n)
16     }
17 }
18 
19 export default new Vuex.Store({
20     state,
21     mutations
22 })

使用页面中的代码

 1 <template>
 2   <div class="hello">
 3     <h2>加减法计算器</h2>
 4     <h3>{{$store.state.num}}</h3>
 5     <div>
 6       <button @click="handleAddClick(10)">增加</button>
 7       <button @click="handleReduceClick(10)">减少</button>
 8     </div>
 9   </div>
10 </template>
11 
12 <script>
13 export default {
14   methods:{
15     handleAddClick(n){
16       this.$store.commit('mutationsAddCount',n)
17     },
18     handleReduceClick(n){
19       this.$store.commit('mutationsReduceCount',n)
20     }
21   }
22 }
23 </script>