// App.vue
<template>
  <div id="app">    
    {{ message }} <br/>
    <!-- <input v-model="message" /> -->
    <input :value="message" @input="updateMessage" />
  </div>
</template>

<script>
// import { mapState, mapActions } from 'vuex';
export default {
  name: 'app',
  computed: {
    message () {
      return this.$store.state.message;
    }
  },
  methods: {
    updateMessage (e) {
      this.$store.commit('updateMessage', e.target.value);
    }
  }
}
</script>

<style>
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

// main.js
import Vue from 'vue'
import Vuex from 'vuex'
import App from './App.vue'

Vue.use(Vuex)
Vue.config.productionTip = false

const store = new Vuex.Store({
  strict: true,
  state: {
    message: 'Hello Vuex'
  },
  mutations: {
    updateMessage (state, message) {
      state.message = message;
    }
  },
  getters: {

  }
});

new Vue({
  render: h => h(App),
  store
}).$mount('#app')