vuex的最佳实践

尽大可能的简化vuex的调用和执行过程

<input :value="message" @input="updateMessage">

computed: {
  ...mapState({
    message: state => state.obj.message
  })
},
methods: {
  updateMessage (e) {
    this.$store.commit('updateMessage', e.target.value)
  }
}

mutations: {
  updateMessage (state, message) {
    state.obj.message = message
  }
}