vue cli 3 以上添加Less支持

npm Less

npm install less less-loader --save

未验证下面这行是否必须

npm i style-resources-loader -D

vue.config.js

// vue.config.js
const path = require('path')
module.exports = {
    // 全局less变量
  pluginOptions: {
  "style-resources-loader": {
    preProcessor: "less",
      // patterns: [path.resolve(__dirname, './src/assets/less/1.less')]
      patterns: []
  }
}
};