这篇文章给大家介绍的内容是关于react antd-mobile项目中如何实现 css 与 less 局部作用域化的功能，有一定的参考价值，有需要的朋友可以参考一下，希望对你有所帮助。
1、前言最近搭建的 react 项目想引入 less ,并实现样式局部作用域化，但是在网上找了很多方法试过了都不行，最后打到解决方法，在此记下这惨痛的历程。
2、create-react-appcreate-react-app 是业界最优秀的 react 相关应用开发工具之一，本文档就是以此工具来使用 antd-mobile 组件。
安装和初始化#$ npm install -g create-react-app# 注意：工具会自动初始化一个脚手架并安装 react 项目的各种必要依赖，如果在过程中出现网络问题，请尝试配置代理或使用其他 npm registry。$ create-react-app my-app$ cd my-app$ npm start
打开 http://localhost:3000/ 访问你的应用。
3、修改 css 配置下面是修改文件 webpack.config.js。
module.exports = { entry: __dirname + '/index.js', output: { publicpath: '/', filename: './bundle.js' }, module: { loaders: [ { test: /\.jsx?$/, exclude: /node_modules/, loader: 'babel', query: { presets: ['es2015', 'stage-0', 'react'] } }, { test: /\.css$/, loader: style-loader!css-loader?modules }, ] } };
上面代码中，关键的一行是style-loader!css-loader?modules，它在css-loader后面加了一个查询参数modules，表示打开 css modules 功能。
4、 配置 less首先安装 less 和 less-loader
npm i --save-dev less less-loader
然后在 webpack.config.dev 中配置 less :
//这里我开启自己编写的less文件的css modules功能 除了node_modules库中的less， //也就是可以过滤掉antd库中的样式 { test: /\.less$/, exclude: [/node_modules/], use: [ require.resolve('style-loader'), { loader: require.resolve('css-loader'), options: { modules: true, localindexname: [name]__[local]___[hash:base64:5] }, }, { loader: require.resolve('less-loader'), // compiles less to css }, ], },
5、完整配置送上完整的 webpack.config.dev 配置：
'use strict';const autoprefixer = require('autoprefixer');const path = require('path');const webpack = require('webpack');const htmlwebpackplugin = require('html-webpack-plugin');const casesensitivepathsplugin = require('case-sensitive-paths-webpack-plugin');const interpolatehtmlplugin = require('react-dev-utils/interpolatehtmlplugin');const watchmissingnodemodulesplugin = require('react-dev-utils/watchmissingnodemodulesplugin');const eslintformatter = require('react-dev-utils/eslintformatter');const modulescopeplugin = require('react-dev-utils/modulescopeplugin');const getclientenvironment = require('./env');const paths = require('./paths');// webpack uses `publicpath` to determine where the app is being served from.// in development, we always serve from the root. this makes config easier.const publicpath = '/';// `publicurl` is just like `publicpath`, but we will provide it to our app// as %public_url% in `index.html` and `process.env.public_url` in javascript.// omit trailing slash as %public_path%/xyz looks better than %public_path%xyz.const publicurl = '';// get environment variables to inject into our app.const env = getclientenvironment(publicurl);// this is the development configuration.// it is focused on developer experience and fast rebuilds.// the production configuration is different and lives in a separate file.module.exports = { // you may want 'eval' instead if you prefer to see the compiled output in devtools. // see the discussion in https://github.com/facebookincubator/create-react-app/issues/343. devtool: 'cheap-module-source-map', // these are the entry points to our application. // this means they will be the root imports that are included in js bundle. // the first two entry points enable hot css and auto-refreshes for js. entry: [ // we ship a few polyfills by default: require.resolve('./polyfills'), // include an alternative client for webpackdevserver. a client's job is to // connect to webpackdevserver by a socket and get notified about changes. // when you save a file, the client will either apply hot updates (in case // of css changes), or refresh the page (in case of js changes). when you // make a syntax error, this client will display a syntax error overlay. // note: instead of the default webpackdevserver client, we use a custom one // to bring better experience for create react app users. you can replace // the line below with these two lines if you prefer the stock client: // require.resolve('webpack-dev-server/client') + '?/', // require.resolve('webpack/hot/dev-server'), require.resolve('react-dev-utils/webpackhotdevclient'), // finally, this is your app's code: paths.appindexjs, // we include the app code last so that if there is a runtime error during // initialization, it doesn't blow up the webpackdevserver client, and // changing js code would still trigger a refresh. ], output: { // add /* filename */ comments to generated require()s in the output. pathinfo: true, // this does not produce a real file. it's just the virtual path that is // served by webpackdevserver in development. this is the js bundle // containing code from all our entry points, and the webpack runtime. filename: 'static/js/bundle.js', // there are also additional js chunk files if you use code splitting. chunkfilename: 'static/js/[name].chunk.js', // this is the url that app is served from. we use / in development. publicpath: publicpath, // point sourcemap entries to original disk location (format as url on windows) devtoolmodulefilenametemplate: info => path.resolve(info.absoluteresourcepath).replace(/\\/g, '/'), }, resolve: { // this allows you to set a fallback for where webpack should look for modules. // we placed these paths second because we want `node_modules` to win // if there are any conflicts. this matches node resolution mechanism. // https://github.com/facebookincubator/create-react-app/issues/253 modules: ['node_modules', paths.appnodemodules].concat( // it is guaranteed to exist because we tweak it in `env.js` process.env.node_path.split(path.delimiter).filter(boolean) ), // these are the reasonable defaults supported by the node ecosystem. // we also include jsx as a common component filename extension to support // some tools, although we do not recommend using it, see: // https://github.com/facebookincubator/create-react-app/issues/290 // `web` extension prefixes have been added for better support // for react native web. extensions: ['.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx'], alias: { // support react native web // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/ 'react-native': 'react-native-web', }, plugins: [ // prevents users from importing files from outside of src/ (or node_modules/). // this often causes confusion because we only process files within src/ with babel. // to fix this, we prevent you from importing files out of src/ -- if you'd like to, // please link the files into your node_modules/ and let module-resolution kick in. // make sure your source files are compiled, as they will not be processed in any way. new modulescopeplugin(paths.appsrc, [paths.apppackagejson]), ], }, module: { strictexportpresence: true, rules: [ // todo: disable require.ensure as it's not a standard language feature. // we are waiting for https://github.com/facebookincubator/create-react-app/issues/2176. // { parser: { requireensure: false } }, // first, run the linter. // it's important to do this before babel processes the js. { test: /\.(js|jsx|mjs)$/, enforce: 'pre', use: [{ options: { formatter: eslintformatter, eslintpath: require.resolve('eslint'), }, loader: require.resolve('eslint-loader'), }, ], include: paths.appsrc, }, { // oneof will traverse all following loaders until one will // match the requirements. when no loader matches it will fall // back to the file loader at the end of the loader list. oneof: [ // url loader works like file loader except that it embeds assets // smaller than specified limit in bytes as data urls to avoid requests. // a missing `test` is equivalent to a match. { test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/], loader: require.resolve('url-loader'), options: { limit: 10000, name: 'static/media/[name].[hash:8].[ext]', }, }, // process js with babel. { test: /\.(js|jsx|mjs)$/, include: paths.appsrc, loader: require.resolve('babel-loader'), options: { // this is a feature of `babel-loader` for webpack (not babel itself). // it enables caching results in ./node_modules/.cache/babel-loader/ // directory for faster rebuilds. cachedirectory: true, }, }, { test: /\.css$/, loader: style-loader!css-loader?modules }, //@lynn 这里我开启自己编写的less文件的css modules功能 除了node_modules库中的less， //也就是可以过滤掉antd库中的样式 { test: /\.less$/, exclude: [/node_modules/], use: [ require.resolve('style-loader'), { loader: require.resolve('css-loader'), options: { modules: true, localindexname:[name]__[local]___[hash:base64:5] }, }, { loader: require.resolve('less-loader'), // compiles less to css }, ], }, // file loader makes sure those assets get served by webpackdevserver. // when you `import` an asset, you get its (virtual) filename. // in production, they would get copied to the `build` folder. // this loader doesn't use a test so it will catch all modules // that fall through the other loaders. { // exclude `js` files to keep css loader working as it injects // its runtime that would otherwise processed through file loader. // also exclude `html` and `json` extensions so they get processed // by webpacks internal loaders. exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/], loader: require.resolve('file-loader'), options: { name: 'static/media/[name].[hash:8].[ext]', }, }, ], }, // ** stop ** are you adding a new loader? // make sure to add the new loader(s) before the file loader. ], }, plugins: [ // extractless, // makes some environment variables available in index.html. // the public url is available as %public_url% in index.html, e.g.: // <link rel="shortcut icon" href="%public_url%/favicon.ico"> // in development, this will be an empty string. new interpolatehtmlplugin(env.raw), // generates an `index.html` file with the <script> injected. new htmlwebpackplugin({ inject: true, template: paths.apphtml, }), // add module names to factory functions so they appear in browser profiler. new webpack.namedmodulesplugin(), // makes some environment variables available to the js code, for example: // if (process.env.node_env === 'development') { ... }. see `./env.js`. new webpack.defineplugin(env.stringified), // this is necessary to emit hot updates (currently css only): new webpack.hotmodulereplacementplugin(), // watcher doesn't work well if you mistype casing in a path so we use // a plugin that prints an error when you attempt to do this. // see https://github.com/facebookincubator/create-react-app/issues/240 new casesensitivepathsplugin(), // if you require a missing module and then `npm install` it, you still have // to restart the development server for webpack to discover it. this plugin // makes the discovery automatic so you don't have to restart. // see https://github.com/facebookincubator/create-react-app/issues/186 new watchmissingnodemodulesplugin(paths.appnodemodules), // moment.js is an extremely popular library that bundles large locale files // by default due to how webpack interprets its code. this is a practical // solution that requires the user to opt into importing specific locales. // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack // you can remove this if you don't use moment.js: new webpack.ignoreplugin(/^\.\/locale$/, /moment$/), ], // some libraries import node modules but don't use them in the browser. // tell webpack to provide empty mocks for them so importing them works. node: { dgram: 'empty', fs: 'empty', net: 'empty', tls: 'empty', child_process: 'empty', }, // turn off performance hints during development because we don't do any // splitting or minification in interest of speed. these warnings become // cumbersome. performance: { hints: false, },};
webpack.config.prod 中的配置也同理，把 css 与 less 的配置覆盖到 webpack.config.prod 中相应的位置即可
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以上就是react antd-mobile项目中如何实现 css 与 less 局部作用域化的功能的详细内容。