首先下载vuex然后看一下项目中main文件内有没有引入store文件并且挂载
import Vue from 'vue'
import App from './App.vue'
import Element from "element-ui"
import "element-ui/lib/theme-chalk/index.css"
import router from "./router/index"
import store from "./store"
Vue.config.productionTip = false
Vue.use