关于react+antd样式不生效问题的解决方式

1、添加antd组件样式不生效

在入口文件中引入import 'antd/dist/antd.css'
样式生效，但是生成警告
WARNING in ./node_modules/antd/dist/antd.css
Failed to parse source map: 'webpack://antd/./components/time-
picker/style/index.less' URL is not supported
 
这样就需要在webpack中配置，react项目默认的配置文件是不显示的，需要运行指令“yarn eject”暴露配置文件
运行时又遇到问题2
 
解决完问题2后
解决1的方法是在webpack.config.dev.js和webpack.config.prod.js文件添加相关配置,然后引入antd.less
暴露出webpack配置后，在webpack.config.js 中更改配置如下
// style files regexes
const cssRegex = /\.(css|less)$/;//此行为更改行！！！！！！！！！
const cssModuleRegex = /\.module\.css$/;
const sassRegex = /\.(scss|sass)$/;
const sassModuleRegex = /\.module\.(scss|sass)$/;
 
const hasJsxRuntime = (() => {
  if (process.env.DISABLE_NEW_JSX_TRANSFORM === 'true') {
    return false;
  }
 
  try {
    require.resolve('react/jsx-runtime');
    return true;
  } catch (e) {
    return false;
  }
})();
 
// This is the production and development configuration.
// It is focused on developer experience, fast rebuilds, and a minimal bundle.
module.exports = function (webpackEnv) {
  const isEnvDevelopment = webpackEnv === 'development';
  const isEnvProduction = webpackEnv === 'production';
 
  // Variable used for enabling profiling in Production
  // passed into alias object. Uses a flag if passed into the build command
  const isEnvProductionProfile =
    isEnvProduction && process.argv.includes('--profile');
 
  // We will provide `paths.publicUrlOrPath` to our app
  // as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
  // Omit trailing slash as %PUBLIC_URL%/xyz looks better than %PUBLIC_URL%xyz.
  // Get environment variables to inject into our app.
  const env = getClientEnvironment(paths.publicUrlOrPath.slice(0, -1));
 
  const shouldUseReactRefresh = env.raw.FAST_REFRESH;
 
  // common function to get style loaders
  const getStyleLoaders = (cssOptions, preProcessor) => {
    const loaders = [
      isEnvDevelopment && require.resolve('style-loader'),
      isEnvProduction && {
        loader: MiniCssExtractPlugin.loader,
        // css is located in `static/css`, use '../../' to locate index.html folder
        // in production `paths.publicUrlOrPath` can be a relative path
        options: paths.publicUrlOrPath.startsWith('.')
          ? { publicPath: '../../' }
          : {},
      },
      {
        loader: require.resolve('css-loader'),
        options: cssOptions,
      },
     //此{}为添加行！！！！！！！！！！！！！！！！！！！
      {
        loader:'less-loader',
        options:{
          javascriptEnabled: true
        }
      },
 

运行代码，后又遇到报错看问题3

报错：Less Loader has been initialized using an options object that does not match theAPIschema

2、运行yarn eject时暴露配置文件报错

This git repository has untracked files or uncommitted changes: .DS_Store

git add .
 
git commit -am "Save before ejecting"
 
然后再运行就可以了

这样的webpack文件中就有了

3、less-loader版本过高，删除旧版本，下载低版本即可

yarn remove less-loader 
 
yarn add less-loader@4.0.1

再运行，代码成功运行

4、项目中引入icon代码报错

export 'Icon' (imported as 'Icon') was not found in 'antd'

Ant Design 从 v3 升级到 v4 导致

图标升级（点击可查看文档），旧版 Icon 使用方式将被废弃，你将仍然可以通过兼容包继续使用：

import { Icon } from '@ant-design/compatible';
 
运行时如果没有安装包，运行指令 yarn add  @ant-design/compatible
 
再重新运行代码就可以了

补充：React中antd按需加载样式不生效解决办法

按照antd官网文档，执行按需加载操作后，样式不生效，很可能是因为在webpack.config.js文件中设置了css模块化；

解决办法：

在终端中执行

npm run eject

弹出config文件夹后，找到webpack.config.js文件

{
              test: cssRegex,
              exclude: cssModuleRegex,
              use: getStyleLoaders({
                importLoaders: 1,//在这行后面添加 modules:false
                modules:false,
                sourceMap: isEnvProduction
                  ? shouldUseSourceMap
                  : isEnvDevelopment,
              }),

总结

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