vue安装less less-loader
npm install less less-loader --save-dev安装依赖
webpack下配置规则{ test: /\.less$/, loader: "style-loader!css-loader!less-loader" }
坑：安装高版本less添加style lang="less" 控制台报错需修改
package.json
在里面找到less和less-loader
“less”: “^3.9.0”,
“less-loader”: “^5.0.0”,
然后把node_modules删除，重新npm install
