新建了一个react项目，在使用react组件的时候，发现样式不生效。
按照官网的单独引入方式可以生效

import 'antd/dist/antd.css';

下面讲一讲全局引入的方法
首先安装babel-plugin-import
npm

npm install babel-plugin-import --save 或 cnpm install babel-plugin-import --save

yarn

yarn add babel-plugin-import

然后配置webpack.config.js

module.exports = {
    entry: [
        './src/app.js'
    ],
    output: {
        path: __dirname + '/build',
        filename: "bundle.js"
    },
    module: {
        rules: [{
            test: /\.js$/,
            exclude: /node_modules/,
            loader: 'babel-loader',
            options: {
                plugins: [
                    [
                        "import",
                        {libraryName: "antd", style: 'css'}
                    ] //antd按需加载
                ],
                presets: ['es2015', 'react', 'stage-2']
            }
        }, {//CSS处理
            test: /\.(css||less)$/,
            exclude: /node_modules/,
            use: [
                require.resolve('style-loader'),
                {
                    loader: require.resolve('css-loader'),
                    options: {
                        importLoaders: 1,
                    },
                },
                {
                    loader: require.resolve('postcss-loader'),
                    options: {
                        // Necessary for external CSS imports to work
                        // https://github.com/facebookincubator/create-react-app/issues/2677
                        ident: 'postcss',
                        plugins: () => [
                            require('postcss-flexbugs-fixes'),
                            autoprefixer({
                                browsers: [
                                    '>1%',
                                    'last 4 versions',
                                    'Firefox ESR',
                                    'not ie < 9', // React doesn't support IE8 anyway
                                ],
                                flexbox: 'no-2009',
                            }),
                        ],
                    },
                },
                {
                    loader: require.resolve('less-loader')
                }
            ],
        },{//antd样式处理
            test:/\.(css||less)$/,
            exclude:/src/,
            use: [
                require.resolve('style-loader'),
                {
                    loader: require.resolve('css-loader'),
                    options: {
                        importLoaders: 1,
                    },
                },
                {
                    loader: require.resolve('postcss-loader'),
                    options: {
                        // Necessary for external CSS imports to work
                        // https://github.com/facebookincubator/create-react-app/issues/2677
                        ident: 'postcss',
                        plugins: () => [
                            require('postcss-flexbugs-fixes'),
                            autoprefixer({
                                browsers: [
                                    '>1%',
                                    'last 4 versions',
                                    'Firefox ESR',
                                    'not ie < 9', // React doesn't support IE8 anyway
                                ],
                                flexbox: 'no-2009',
                            }),
                        ],
                    },
                },
                {
                    loader: require.resolve('less-loader')
                }
            ]
        }]
    }
};

注意，如果按照

plugins: [
                            [
                                "import",
                                {libraryName: "antd", style: 'css'}
                            ] //antd按需加载
                        ]

引入，会发现antd的样式还是不生效，是因为要将系统的css和antd的css进行分开处理。