当我指出 ChatGPT 的错误，它竟然改过来了

ChatGPT 的回答一般挺不错的，比搜索引擎好很多。经常问它一些问题，大部分时候有满意的答案。当然不是 100% 满意，有时答案是错的，甚至明显是错的，然后我就会忽略错误答案，或者它的回答不完全对，但我也能补充出正确答案，然后就结束对话了。但今天我尝试指出它的错误，它竟然修复了。

起因：

我想写一段 JavaScript 使用 sftp 传文件夹的代码，

首先安装依赖

npm install ssh2-sftp-client

ChatGPT 给的答案是：

const Client = require('ssh2-sftp-client');
const path = require('path');
const fs = require('fs');

const sftp = new Client();

const config = {
  host: 'your.server.com',
  port: 22,
  username: 'your-username',
  password: 'your-password', // Alternatively, use SSH keys
  // privateKey: require('fs').readFileSync('/path/to/your/private-key')
};

const localDir = '/path/to/local/folder';  // Local directory to upload
const remoteDir = '/path/to/remote/folder'; // Remote destination directory

// Function to recursively upload files and directories
async function uploadDir(localPath, remotePath) {
  try {
    // Connect to the SFTP server
    await sftp.connect(config);

    // Ensure the remote directory exists
    await sftp.mkdir(remotePath, true);  // 'true' means recursive mkdir

    // Read the contents of the local directory
    const files = await fs.promises.readdir(localPath);

    // Iterate through each file/subdirectory in the local directory
    for (let file of files) {
      const localFile = path.join(localPath, file);
      const remoteFile = path.join(remotePath, file);

      // Check if it's a file or directory
      const stats = await fs.promises.stat(localFile);

      if (stats.isDirectory()) {
        // If it's a directory, recursively upload it
        await uploadDir(localFile, remoteFile);
      } else {
        // If it's a file, upload it
        await sftp.put(localFile, remoteFile);
        console.log(`Uploaded file: ${localFile} -> ${remoteFile}`);
      }
    }
    console.log('Directory upload complete!');
  } catch (err) {
    console.error('Error uploading directory:', err);
  } finally {
    // Close the SFTP connection
    sftp.end();
  }
}

// Start uploading the directory
uploadDir(localDir, remoteDir);

这里有个问题，文件夹可能会有子文件夹，会递归调用 uploadDir 方法，在递归调用时会重复连接 sftp ，会报错：

Error: connect: An existing SFTP connection is already defined
    at SftpClient.fmtError (/Users/wjf/wjf/repo/js-scp/node_modules/ssh2-sftp-client/src/index.js:94:22)
    at SftpClient.connect (/Users/wjf/wjf/repo/js-scp/node_modules/ssh2-sftp-client/src/index.js:188:20)
    at uploadDir (/Users/wjf/wjf/repo/js-scp/test2.js:32:20)
    at uploadDir (/Users/wjf/wjf/repo/js-scp/test2.js:50:23) {
  code: 'ERR_NOT_CONNECTED',
  custom: true
}

于是向 ChatGPT 指出错误：This code do not work. Because in the recursion, you connect sftp multiple times

于是 ChatGPT 重新写了代码，把连接 sftp 放在递归函数的外面，给出了可运行的代码。

const Client = require('ssh2-sftp-client');
const path = require('path');
const fs = require('fs');

const sftp = new Client();

const config = {
  host: 'your.server.com',
  port: 22,
  username: 'your-username',
  password: 'your-password', // Alternatively, use SSH keys
  // privateKey: require('fs').readFileSync('/path/to/your/private-key')
};

const localDir = '/path/to/local/folder';  // Local directory to upload
const remoteDir = '/path/to/remote/folder'; // Remote destination directory

// Function to recursively upload files and directories
async function uploadDir(localPath, remotePath) {
  try {
    // Read the contents of the local directory
    const files = await fs.promises.readdir(localPath);

    // Iterate through each file/subdirectory in the local directory
    for (let file of files) {
      const localFile = path.join(localPath, file);
      const remoteFile = path.join(remotePath, file);

      // Check if it's a file or directory
      const stats = await fs.promises.stat(localFile);

      if (stats.isDirectory()) {
        // If it's a directory, create it on the remote server
        await sftp.mkdir(remoteFile, true); // 'true' means recursive mkdir
        console.log(`Created directory: ${remoteFile}`);

        // Recursively upload the directory's contents
        await uploadDir(localFile, remoteFile);
      } else {
        // If it's a file, upload it
        await sftp.put(localFile, remoteFile);
        console.log(`Uploaded file: ${localFile} -> ${remoteFile}`);
      }
    }
    console.log('Directory upload complete!');
  } catch (err) {
    console.error('Error uploading directory:', err);
  }
}

// Start the upload process
async function startUpload() {
  try {
    // Connect to the SFTP server once
    await sftp.connect(config);

    // Upload the entire directory
    await uploadDir(localDir, remoteDir);
  } catch (err) {
    console.error('Error during connection or upload:', err);
  } finally {
    // Always end the SFTP connection when done
    sftp.end();
  }
}

// Start the process
startUpload();

没想到人工智能还可以这样操作！