train-student/src/store/index.js

import Vue from 'vue';
import Vuex from 'vuex';
import leave from './leave';
import attendance from './attendance';
import group from './group';
Vue.use(Vuex);

export default new Vuex.Store({
  modules: {
    leave,
    attendance,
    group,
  },
  state: {}, //变量
  mutations: {}, //同步方法
  actions: {}, //异步操作
});