vue-cli4使用全局less文件中的变量配置操作

// vue.config.js
const path = require('path')
 
module.exports = {
 lintOnSave: false,
 chainWebpack: config => {
 const types = ['vue-modules', 'vue', 'normal-modules', 'normal']
 types.forEach(type => addStyleResource(config.module.rule('less这里写你的样样式类型').oneOf(type)))
 },
}
 
function addStyleResource (rule) {
 rule.use('style-resource')
 .loader('style-resources-loader')
 .options({
  patterns: [
  path.resolve(__dirname, './src/assets/css/global.less这里写你的全局样式地址'),
  ],
 })
}

module: {
  resolve: {
  extensions: ['.ts', '.js', '.vue', '.json'],
  // 顺带说下 此处可以配置路径别名，以后引入文件就不需要../../../这样了，直接@/就可以了，代表src下的路径，可设置多个，可自行配制
  alias: {
   '@': utils.resolve('src')
  }
  },
  ///
 rules: [
   ...(config.dev.useEslint ? [createLintingRule()] : []),
   // /-------------
  {
   test: /\.less$/,
   use: [{
    loader: process.env.NODE_ENV === 'production' ? MiniCssExtractPlugin.loader : 'vue-style-loader'
   }, {
    loader: 'css-loader',
    options: {
    sourceMap: cssSourceMap
    }
   }, {
    loader: 'less-loader',
    options: {
    sourceMap: cssSourceMap
    }
   }
   //此处开始------/ 
   {
    loader: 'sass-resources-loader',
    options: {
    resources: [
     path.resolve(__dirname, '此处写自己配置的公共变量文件路径，比如../src/themes/publicStyle/mon.less')
    ]
    }
    //此处结束-------/ 
   }]
  },

const path = require("path");
function resolve(dir) {
 return path.join(__dirname, dir);
}
module.exports = {
 publicPath: "./",
 outputDir: "dist",
 assetsDir: "assets",
 indexPath: "index.html",
 filenameHashing: true,
 pages: undefined,
 lintOnSave: true,
 runtimeCompiler: false,
 transpileDependencies: [],
 productionSourceMap: false,
 crossorigin: undefined,
 integrity: false,
 devServer: {
 proxy: {
  "/api": {
  target: "",
  changeOrigin: true,
  pathRewrite: { "^/api": "" }
  }
 }
 },
 // ------------------此处开始，以下是全局变量注入的配置--------------
 chainWebpack: config => {
 config.resolve.alias.set("@assets", resolve("src/assets"))
 // 这里只写了两个个，你可以自己再加，按这种格式.set("", resolve(""))
 const types = ["vue-modules", "vue", "normal-modules", "normal"]
 types.forEach(type =>
  addStyleResource(config.module.rule("less").oneOf(type))
 );
 },
 css: {
 loaderOptions: {
  less: {
  javascriptEnabled: true
  }
 }
 }
};
function addStyleResource(rule) {
 rule
 .use("style-resource")
 .loader("style-resources-loader")
 .options({
  patterns: [
  path.resolve(__dirname, "src/styles/index.less") // 需要全局导入的less
  ]
 })
}

npm install -D less-loader less
npm i style-resources-loader
npm i vue-cli-plugin-style-resources-loader

const path = require('path');
module.exports = {
 pluginOptions: {
  'style-resources-loader': {
   preProcessor: 'less',
   patterns: [
    // 这个是加上自己的路径,不能使用(如下:alias)中配置的别名路径
    path.resolve(__dirname, './src/style/params.less')
   ]
  }
 },
 ……
 其他配置
 ……
}