vuex.html

<script src="https://npmcdn.com/vue@next/dist/vue.js"></script>
<script src="https://npmcdn.com/vuex@next"></script>

<div id="app">
  {{ count }}
  <button @click="increment"> + </button>
  <button @click="decrement"> - </button>
</div>

<script>
const counterModule = {
  state: {
    count: 1
  },
  mutations: {
    increment (state) {
      state.count++
    },
    decrement (state) {
      state.count--
    }
  },
  actions: {
    incrementAsync (store) {
      setTimeout(function () {
        store.commit('increment')
      }, 1000)
    }
  }
}

const store = new Vuex.Store({
  strict: true,
  modules: {
    counter: counterModule
  }
})

const app = new Vue({
  computed: {
    count () {
      return store.state.counter.count
    }
  },
  methods: {
    increment () {
      store.commit('increment')
    },
    decrement () {
      store.commit('decrement')
    },
    incrementAsync () {
      store.dispatch('incrementAsync')
    }
  }
}).$mount('#app')
</script>