控制檯出現的錯誤如下：

webpack.config.js中的配置如下：

module.exports={
    entry:'./src/main.js',
    output:{
      path:__dirname,
      filename:'dist/app.js'
    },
    module:{
        rules:[
            {test:/\.js/,loader:'babel-loader',exclude:/node_modules/},
            {test:/\.css/,loader:'css-loader!style-loader'},
 

            {test:/\.(png|jpeg|jpg|ttf|gif)/,loader:'file-loader'}
        ]
    },
    devServer:{
        disableHostCheck:true
    }
}

　　package.json中安裝資訊如下：

"devDependencies": {
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.5",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "css-loader": "^2.0.2",
    "file-loader": "^3.0.1",
    "style-loader": "^0.23.1",
    "webpack": "^4.28.1",
    "webpack-cli": "^3.1.2",
    "webpack-dev-server": "^3.1.13"
  },

      外掛頁面是這樣引入css檔案的：