在使用element-ui组件的外层加一层

<client-only placeholder="Loading..."><van-button type="primary">主要按钮</van-button>
</client-only>

实际使用：

  <div class="tab"><client-only placeholder=""><el-tabs v-model="activeName" @tab-click="handleClick"><el-tab-pane label="测试" name="first"></el-tab-pane><el-tab-pane label="训练" name="second"></el-tab-pane></el-tabs></client-only></div>

参考文章：控制台报错 [Vue warn]: The client-side rendered virtual DOM tree is not matching server-rendered content.-CSDN博客