建议：不要在webpack.config.js里配置devserver

[lovefox666]

devServer: {
contentBase: path.join(__dirname, 'dist'),
compress: true,
port: 3000
},
配置麻烦，建议在package.json里scripts里增加，示例如下：
"scripts": {
"test": "echo "Error: no test specified" && exit 1",
"dev": "webpack-dev-server --open --contentBase src --hot"
},