1.安装px2rem
npm install px2rem-loader --save-dev

2.安装lib-flexible
npm install lib-flexible --save-dev

3.全局引入lib-flexibe
import 'lib-flexible/flexible'

4.build utils.js配置转换率
var px2remLoader = {
  loader: 'px2rem-loader',
  options: {
    remUnit: 136.6 //设计稿宽度/10
  }
};

// generate loader string to be used with extract text plugin
function generateLoaders(loader, loaderOptions) {
  var loaders = [cssLoader, px2remLoader]; //添加px2rem 插件
  if (loader) {
    loaders.push({
      loader: loader + '-loader',
      options: Object.assign({}, loaderOptions, {
        sourceMap: options.sourceMap
      })
    })
  }