## .babelc 文件配置{"presets": [ [ "@babel/preset-react", { "pragma": "dom", // default pragma is React.createElement (only in classic runtime) "pragmaFrag": "DomFrag", // default is React.Fragment (only in classic runtime) "throwIfNamespace": false, // defaults to true "runtime": "classic" // defaults to classic // "importSource": "custom-jsx-library" // defaults to react (only in automatic runtime) } ], ],}## webpack 配置rules: [ { test: /\.jsx?$/, use: { loader: 'babel-loader', options: { presets: [ "@babel/preset-react", "@babel/preset-env" ] } }, exclude: [ resolve('public'), resolve('node_modules'), ], include: [resolve('src')], },]## 这个是报错You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders| }|> ReactDOM.render(<Index />, document.getElementById('app'));