nodejs实现图片压缩的多种方法，至少5个

Node.js实现图片压缩的多种方法如下：

1. 使用`sharp`库来进行图片压缩

const sharp = require('sharp');

sharp('original.jpg')
  .resize(500)
  .toFile('compressed.jpg', (err, info) => {
    console.log(info);
  });

2. 使用`jimp`库进行图片压缩

const Jimp = require('jimp');

Jimp.read('original.jpg', (err, image) => {
  if (err) throw err;
  image
    .quality(60)
    .write('compressed.jpg');
});

3. 使用`imagemin`库进行图片压缩

const imagemin = require('imagemin');
const imageminMozjpeg = require('imagemin-mozjpeg');
const imageminPngquant = require('imagemin-pngquant');

(async () => {
  const files = await imagemin(['images/*.{jpg,png}'], {
    destination: 'build/images',
    plugins: [
      imageminMozjpeg({quality: 60}),
      imageminPngquant({quality: [0.6, 0.8]})
    ]
  });

  console.log(files);
})();

4. 使用`node-lambdanative`库进行图片压缩

const native = require('node-lambdanative');
const fs = require('fs');

const input = fs.readFileSync('original.jpg');
const output = native.compress(input, {quality: 60});

fs.writeFileSync('compressed.jpg', output);

5. 使用`lwip`库进行图片压缩

const lwip = require('lwip');

lwip.open('original.jpg', (err, image) => {
  if (err) throw err;
  image.batch()
    .resize(500)
    .writeFile('compressed.jpg', err => {
      if (err) throw err;
      console.log('Image compressed successfully');
    });
});

以上是Node.js实现图片压缩的5种方法，你可以根据自己的需求选择适合自己的方法。