nodejs如何合并文件

Node.js提供了多种合并文件的方式，以下是其中的一些示例：

1.使用fs模块的readFileSync和writeFileSync方法：

const fs = require('fs');

const file1 = fs.readFileSync('file1.txt');
const file2 = fs.readFileSync('file2.txt');

fs.writeFileSync('merged.txt', file1 + file2);

2.使用fs模块的createReadStream和createWriteStream方法：

const fs = require('fs');

const readStream1 = fs.createReadStream('file1.txt');
const readStream2 = fs.createReadStream('file2.txt');
const writeStream = fs.createWriteStream('merged.txt');

readStream1.pipe(writeStream);
readStream2.pipe(writeStream);

3.使用fs-extra模块的concat方法：

const fse = require('fs-extra');

fse.concat(['file1.txt', 'file2.txt'], 'merged.txt')
    .then(() => console.log('Files merged successfully.'))
    .catch(err => console.error(err));

这些示例都是将两个文件合并成一个文件，如果要合并多个文件，只需按照相应的方法依次添加即可。