js引入css和sass:

require('../node_modules/*/*.css');
require("./style/style.scss")

webpack.config.js加入

module: {
        rules: [{
            test: /\.(css|scss)$/,
            loader:"style-loader!css-loader!postcss-loader!sass-loader"
        }],
    },

同级目录新建postcss.config.js

module.exports = {
  plugins: [
    require('autoprefixer')({browsers:'ios >= 8'})
  ]
}

完成