如果你可以添加一个库，base64-arraybuffer:

yarn add base64-arraybuffer

然后:

encode(buffer) -将ArrayBuffer编码为base64字符串 decode(str) -解码base64字符串到ArrayBuffer

下面是两个简单的函数，用于将Uint8Array转换为Base64 String

arrayToBase64String(a) {
    return btoa(String.fromCharCode(...a));
}

base64StringToArray(s) {
    let asciiString = atob(s);
    return new Uint8Array([...asciiString].map(char => char.charCodeAt(0)));
}

我使用TextDecode api将其转换为普通文本，然后将其转换为Base64

const uint =  new Uint8Array([ 73, 32, 108, 111, 118, 101, 32, 121, 111, 117 ]).buffer
const decoder = new TextDecoder()
const decodedText = decoder.decode(uint)
const base64Code = btoa(decodedText)

这招对我很管用:

Buffer.from(myArrayBuffer).toString("base64");

const blob = new Blob([array]);        
const reader = new FileReader();

reader.onload = (event) => {
  const dataUrl = event.target.result;
  const [_, base64] = dataUrl.split(','); 
  // do something with base64
};
   
reader.readAsDataURL(blob);

或作为一种许诺的效用:

async function encode(array) {
  return new Promise((resolve) => {
    const blob = new Blob([array]);
    const reader = new FileReader();
    
    reader.onload = (event) => {
      const dataUrl = event.target.result;
      const [_, base64] = dataUrl.split(',');
      
      resolve(base64);
    };
    
    reader.readAsDataURL(blob);
  });
}

const encoded = await encode(typedArray);

OP没有指定运行环境，但如果你使用Node.JS，有一个非常简单的方法来做这件事。

与官方Node.JS文档一致 https://nodejs.org/api/buffer.html#buffer_buffers_and_character_encodings

// This step is only necessary if you don't already have a Buffer Object
const buffer = Buffer.from(yourArrayBuffer);

const base64String = buffer.toString('base64');

另外，如果你在Angular下运行，缓冲区类也会在浏览器环境中可用。