npm install --save-dev postcss-loader

{ test://.css$/, use:[  'style-loader','css-loader?importLoaders=1','postcss-loader'  ] }

module.exports = {  plugins: [    require('autoprefixer')({ /* ...options */ })  ]}

module.exports = {  plugins: [    new webpack.LoaderOptionsPlugin({      options: {        postcss: function(){          return [            require("autoprefixer")({              browsers: ['ie>=8','>1% in CN']            })          ]        }      }    })  ]}