在节点“缓冲区实例也是Uint8Array实例”，所以buf.toString()在这种情况下工作。

Uint8Array to String

let str = Buffer.from(key.secretKey).toString('base64');

String到Uint8Array

let uint8arr = new Uint8Array(Buffer.from(data,'base64')); 

Albert给出的解决方案，只要不经常调用所提供的函数，并且只用于大小适中的数组，就能很好地工作，否则效率非常低。下面是一个增强的普通JavaScript解决方案，它适用于Node和浏览器，具有以下优点:

•有效工作于所有八字节数组大小

•不生成中间丢弃字符串

•在现代JS引擎上支持4字节字符(否则“?”将被替换)

var utf8ArrayToStr = (function () {
    var charCache = new Array(128);  // Preallocate the cache for the common single byte chars
    var charFromCodePt = String.fromCodePoint || String.fromCharCode;
    var result = [];

    return function (array) {
        var codePt, byte1;
        var buffLen = array.length;

        result.length = 0;

        for (var i = 0; i < buffLen;) {
            byte1 = array[i++];

            if (byte1 <= 0x7F) {
                codePt = byte1;
            } else if (byte1 <= 0xDF) {
                codePt = ((byte1 & 0x1F) << 6) | (array[i++] & 0x3F);
            } else if (byte1 <= 0xEF) {
                codePt = ((byte1 & 0x0F) << 12) | ((array[i++] & 0x3F) << 6) | (array[i++] & 0x3F);
            } else if (String.fromCodePoint) {
                codePt = ((byte1 & 0x07) << 18) | ((array[i++] & 0x3F) << 12) | ((array[i++] & 0x3F) << 6) | (array[i++] & 0x3F);
            } else {
                codePt = 63;    // Cannot convert four byte code points, so use "?" instead
                i += 3;
            }

            result.push(charCache[codePt] || (charCache[codePt] = charFromCodePt(codePt)));
        }

        return result.join('');
    };
})();

到目前为止，对我来说最简单的方法是:

//1. Create or fetch the Uint8Array to use in the example
const bufferArray = new Uint8Array([10, 10, 10])

//2. Turn the Uint8Array into a regular array
const array = Array.from(bufferArray);

//3. Stringify it (option A)
JSON.stringify(array);


//3. Stringify it (option B: uses @serdarsenay code snippet to decode each item in array)
let binArrayToString = function(binArray) {
    let str = "";
    for (let i = 0; i < binArray.length; i++) {        
        str += String.fromCharCode(parseInt(binArray[i]));
    }
    return str;
}

binArrayToString(array);

在一个Chrome示例应用程序中可以找到，尽管这意味着对于更大的数据块，您可以接受异步转换。

/**
 * Converts an array buffer to a string
 *
 * @private
 * @param {ArrayBuffer} buf The buffer to convert
 * @param {Function} callback The function to call when conversion is complete
 */
function _arrayBufferToString(buf, callback) {
  var bb = new Blob([new Uint8Array(buf)]);
  var f = new FileReader();
  f.onload = function(e) {
    callback(e.target.result);
  };
  f.readAsText(bb);
}

var decodedString = decodeURIComponent（escape（String.fromCharCode（...new Uint8Array（err））））; var obj = JSON.parse（decodedString）;