index-vuex1.js

import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

export default new Vuex.Store({
	state: {
		count: 0
	},
	getters: {
		getCounter: state => {
			return state.count
		}
	},
	mutations: {
		increment (state) {
			state.count++	
		},
		decrement (state) {
			if(state.count > 0) {
				state.count--
			}
		}
	}	
})