vue项目开发中的问题：Failed to mount component: template or render function not defined.

1.错误提示

vue.runtime.esm.js?2b0e:619 [Vue warn]: Failed to mount component: template or render function not defined.

found in

---> <Anonymous>
      <App> at src/App.vue
        <Root>

2.解决方法

将这种引入方法修改为以下这种就好了