如何利用Node.js流（Stream）处理大文件？

const fs = require('fs');

// 创建可读流和可写流
const readStream = fs.createReadStream('large-file.txt');
const writeStream = fs.createWriteStream('copy-large-file.txt');

// 使用 pipe 将读取的数据直接写入目标文件
readStream.pipe(writeStream);

writeStream.on('finish', () => {
  console.log('文件复制完成');
});

const fs = require('fs');
const zlib = require('zlib');

const readStream = fs.createReadStream('large-file.txt');
const writeStream = fs.createWriteStream('large-file.txt.gz');
const gzip = zlib.createGzip();

// 读取 → 压缩 → 写入
readStream.pipe(gzip).pipe(writeStream);

readStream.on('error', (err) => {
  console.error('读取失败:', err);
});

writeStream.on('error', (err) => {
  console.error('写入失败:', err);
});

writeStream.on('close', () => {
  console.log('写入流已关闭，任务完成');
});

readStream.on('data', (chunk) => {
  console.log(`读取到 ${chunk.length} 字节`);
  // 可在此处处理 chunk，然后写入
  writeStream.write(chunk);
});