如何將十六進制字符串轉換爲Uint8Array並返回到JavaScript中？

Question

我想將bada55之類的十六進制字符串轉換爲Uint8Array，然後再返回。

Answer 1

下面是使用Ramda一個解決方案：

const hexadecimalToUint8Array = string => 
 
    new Uint8Array(R.map(byte => parseInt(byte, 16), R.splitEvery(2, string))) 
 

 
const uint8ArrayToHexadecimal = array => 
 
    R.reduce((string, byte) => string + byte.toString(16), '', array) 
 

 
const badass = hexadecimalToUint8Array('bada55') 
 

 
console.log(badass, '=', uint8ArrayToHexadecimal(badass))

<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.22.1/ramda.min.js"></script>

Answer 2

下面是原生的JavaScript的解決方案：

var string = 'bada55'; 
var bytes = new Uint8Array(Math.ceil(string.length/2)); 
for (var i = 0; i < bytes.length; i++) bytes[i] = parseInt(string.substr(i * 2, 2), 16); 
console.log(bytes); 

var convertedBack = ''; 
for (var i = 0; i < bytes.length; i++) { 
    if (bytes[i] < 16) convertedBack += '0'; 
    convertedBack += bytes[i].toString(16); 
} 
console.log(convertedBack);