js 动态加版本号

const path = require('path');
const webpack = require('webpack');

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.[contenthash].js',
    path: path.resolve(__dirname, 'dist')
  },
  plugins: [
    new webpack.HashedModuleIdsPlugin()
  ]
};

const express = require('express');
const app = express();
const path = require('path');

app.use('/static', express.static(path.join(__dirname, 'public'), {
  setHeaders: (res, filePath) => {
    if (path.extname(filePath) === '.js') {
      res.setHeader('Cache-Control', 'public, max-age=31536000');
      const hash = require('crypto').createHash('md5').update(filePath).digest('hex');
      res.setHeader('ETag', hash);
    }
  }
}));

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

function addVersion(url) {
  const version = new Date().getTime(); // 或者使用其他唯一标识符
  return `${url}?v=${version}`;
}

const script = document.createElement('script');
script.src = addVersion('/static/bundle.js');
document.head.appendChild(script);