解决lib-flexible安装过程中遇到的错误问题

const px2remLoader = {
  loader: 'px2rem-loader',
  options:{
    remUnit:75
  }
}
const postcssLoader = {
  loader: 'postcss-loader',
  options: {
    sourceMap: options.sourceMap
  }
}

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