vuex必须在创建存储实例之前调用Vue.use(vuex)

store.js

import Vuex from 'vuex';

export default new Vuex.Store({
  state: { customers: [] },
  mutations: {
    addCustomer (customer) {
      state.customers.push(customer);
    }
  }
});

在我的 main.js 我指的是这家店,但是 vue-devtools 始终返回 [vuex] must call Vue.use(Vuex) before creating a store instance. :

import Vue from 'vue';
import Vuex from 'vuex';
Vue.use(Vuex);    
import store from './store'
new Vue({
  store,
  render: h => h(App),
}).$mount('#app');