webpack设置热更新

"dev": "webpack-dev-server --mode development --hot"

if (module.hot) {
  module.hot.accept()
}

  plugins: [
    new HtmlWebpackPlugin({
      template: ‘./public/index.html‘
    }),
    // --hot 等于这样的写法
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NamedModulesPlugin()
  ],
  devServer: {
    contentBase: ‘./dist‘,
    hot: true
  }