node.js 回调 数据错乱

const fs = require('fs').promises;

async function readFileAsync() {
  try {
    const data1 = await fs.readFile('file1.txt', 'utf8');
    const data2 = await fs.readFile('file2.txt', 'utf8');
    console.log(data1, data2);
  } catch (error) {
    console.error('Error reading files:', error);
  }
}

readFileAsync();

const fs = require('fs').promises;

async function readFile(filename) {
  try {
    return await fs.readFile(filename, 'utf8');
  } catch (error) {
    console.error(`Error reading ${filename}:`, error);
    throw error;
  }
}

async function processFiles() {
  try {
    const data1 = await readFile('file1.txt');
    const data2 = await readFile('file2.txt');
    console.log(data1, data2);
  } catch (error) {
    console.error('Error processing files:', error);
  }
}

processFiles();

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

const tasks = [
  (callback) => fs.readFile('file1.txt', 'utf8', callback),
  (callback) => fs.readFile('file2.txt', 'utf8', callback)
];

async.series(tasks, (err, results) => {
  if (err) {
    console.error('Error reading files:', err);
  } else {
    console.log(results[0], results[1]);
  }
});