const moduleA = {
 state: () => ({ ... }),
 mutations: { ... },
 actions: { ... },
 getters: { ... }
}
 
const moduleB = {
 state: () => ({ ... }),
 mutations: { ... },
 actions: { ... }
}
 
const store = new Vuex.Store({
 modules: {
 a: moduleA,
 b: moduleB
 }
})
 
store.state.a // -> moduleA 的状态
store.state.b // -> moduleB 的状态

import Vue from 'vue'
import Vuex from 'vuex'
import demo from './modules/demo/demo.js';
Vue.use(Vuex);
const $store = new Vuex.Store({
　　modules: {
　　　　demo
　　}
});
export default $store;

import state from './state.js';
import mutations from './mutations.js';
// 按需要导入
// import getters from './getters.js';
// import actions from './actions.js';

export default{
// 将导入的文件暴露出去
 state,
 mutations
}

import Vue from 'vue'
import App from './App'
import router from './router'
import { RouterMount } from 'uni-simple-router'
//引入vuex
import store from './store'
//把vuex定义成全局组件
Vue.prototype.$store = store

Vue.config.productionTip = false

App.mpType = 'app'

const app = new Vue({
 store,
  ...App
})
app.$mount();