在没有FileReader的NodeJS中将Blob转换为Base64

npm install buffer

const Buffer = require('buffer').Buffer;

const blobToBase64 = (blob) => {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onloadend = () => {
      const buffer = Buffer.from(reader.result);
      const base64 = buffer.toString('base64');
      resolve(base64);
    };
    reader.onerror = reject;
    reader.readAsArrayBuffer(blob);
  });
};

const blob = new Blob(['Hello, World!'], { type: 'text/plain' });

blobToBase64(blob)
  .then((base64) => {
    console.log(base64);
  })
  .catch((error) => {
    console.error(error);
  });