webpack开启热更新模块

首先上代码

注意代码中的devServer

里面的hot、hotOnly都设置为true

拉下webpack的 HotModuleReplacementPlugin模块

然后实例化即可

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const {CleanWebpackPlugin} = require('clean-webpack-plugin')
const webpack = require('webpack')

module.exports ={
  mode: 'development',
  devServer: {
    hot: true,
    hotOnly: true,
    contentBase: path.resolve(__dirname, 'dist')
  },
  entry: {
    main: './src/index.js'
  },
  output: {
    filename: '[name].js',
    path: path.resolve(__dirname, 'dist')
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'style-loader',
          'css-loader',
          'postcss-loader'
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html'
    }),
    new CleanWebpackPlugin(),
    new webpack.HotModuleReplacementPlugin()
  ]
}