当vuex状态改变时，调用侧组件中的方法

// store.js
import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

const store = new Vuex.Store({
  state: {
    count: 0
  },
  mutations: {
    increment(state) {
      state.count++
    }
  }
})

export default store

// MyComponent.vue
<template>
  <div>
    <p>{{ count }}</p>
    <button @click="incrementCount">Increment</button>
  </div>
</template>

<script>
import { mapState, mapMutations } from 'vuex'

export default {
  computed: {
    ...mapState(['count'])
  },
  methods: {
    ...mapMutations(['increment']),
    incrementCount() {
      this.increment() // 调用vuex中的increment方法
    }
  }
}
</script>