Node生成QRコードqrcode base 64

var QRCode = require('qrcode')

QRCode.toString('I am a pony!I am a pony!I am a pony!I am a pony!',{type: 'svg'}, function (err, url) {
  console.log(url)
  console.log('data:image/svg+xml;base64,' + Buffer(url).toString('base64'))
})

var qr = require('qr-image');

var qr_svg = qr.imageSync('I love QR!', { type: 'svg' });
console.log(qr_svg);
console.log('-----------------');
console.log(Buffer(qr_svg).toString('base64'));