1. 参考：https://tailwind.nodejs.cn/docs/guides/vite#vue 和 https://blog.csdn.net/hjl_and_djj/article/details/144694485
2. 依次运行命令： cnpm install -D tailwindcss@3.4.17 postcss autoprefixer
3. npx tailwindcss init -p
4. 修改配置文件tailwind.config.js：

/** @type {import('tailwindcss').Config} */
export default {content: ["./index.html","./src/**/*.{vue,js,ts,jsx,tsx}",],theme: {extend: {},},plugins: [],
}

5. 根目录下修改生成的style.css或styles/index.scss

@tailwind base;
@tailwind components;
@tailwind utilities;

6. 根据参考，设置vscode忽略未知的规则，消除@警告
7. 测试<h1 class="text-3xl font-bold underline">Hello world!</h1>
8. 如果不行，继续修改vite.config.js

import { defineConfig, loadEnv } from 'vite'
import path from 'path'
import createVitePlugins from './vite/plugins'
import tailwindcss from 'tailwindcss';
import autoprefixer from 'autoprefixer';css: {postcss: {plugins: [tailwindcss,autoprefixer,{postcssPlugin: 'internal:charset-removal',AtRule: {charset: (atRule) => {if (atRule.name === 'charset') {atRule.remove();}}}}]}},