vue.esm.js?efeb:628 [Vue warn]: Unknown custom element: <el-menu> - did you register the component correctly? For recursive components, make sure to provide the "name" option.
found in
---> <Test> at src/components/test.vue
       <App> at src/App.vue
报错原因，忘记注册组件了，我可真的是个粗心的小可爱呐
解决办法：打开入口文件main.js，添加一下代码即可。
import ElementUI from 'element-ui' //element-ui的全部组件
import 'element-ui/lib/theme-chalk/index.css'//element-ui的css
Vue.use(ElementUI) //使用elementUI
                            
error - element - Unknown custom element: <el-upload> - did you register the component correctl
                            
cdn 引入 Unknown custom element: - did you register the component correctly? For recursive components, make sure to provide the "name" option. // 报错 <sc ...