Feature flag __VUE_PROD_HYDRATION_MISMATCH_DETAILS__ is not explicitly defined. You are running the esm-bundler build of Vue, which expects these compile-time feature flags to be globally injected via the bundler config in order to get better tree-shaking in the production bundle.

不知道什么时候控制台就出现了一个黄色警告，刚开始没在意，觉得我代码写完应该就没了，结果一直在……有点点强迫症，就搜了一下解决办法[😁]，但是那位博主加的有点多，我就加了几句也解决了，就没管其他的了。（啰嗦如我）

在vite.config.ts里面加这一段：

import { defineConfig } from "vite";

export default defineConfig({
  define: {
    __VUE_PROD_HYDRATION_MISMATCH_DETAILS__: "true",
  },
});

OK，控制台干净了。 

参考博文：

https://blog.csdn.net/cg_ssh/article/details/135396904