ArrayBuffer转为base64

可以使用以下代码将 ArrayBuffer 转换为 base64 编码：

function arrayBufferToBase64(buffer) {
  let binary = '';
  const bytes = new Uint8Array(buffer);
  const len = bytes.byteLength;
  for (let i = 0; i < len; i++) {
    binary += String.fromCharCode(bytes[i]);
  }
  return window.btoa(binary);
}

使用示例：

const myArrayBuffer = new ArrayBuffer(8);
const base64String = arrayBufferToBase64(myArrayBuffer);
console.log(base64String);