2、组件--commit方法直接派发事件给mutation

一、 home.vue

<template>
  <div class="home">
     home
     <button  @click="add">
       {{this.$store.state.count}}</button>
  </div>
</template>
<script>
export default {
  name: 'Home',
  methods:{
    add(){
      this.$store.commit("addCount")
    }
  }
}
</script>

二、vuex

export default new Vuex.Store({
  state: {
    count:1
  },
  mutations: {
    addCount(state){
      console.log("state");
      state.count++;
    }
  },
  modules: {
  }
})