如何将十六进制字符串转换为Uint8Array并返回JavaScript？

const fromHexString = hexString =>
  new Uint8Array(hexString.match(/.{1,2}/g).map(byte => parseInt(byte,16)));

const toHexString = bytes =>
  bytes.reduce((str,byte) => str + byte.toString(16).padStart(2,'0'),'');

console.log(toHexString(new Uint8Array([0,1,2,42,100,101,102,255])))
console.log(fromHexString('0001022a646566ff'))

注意：此方法始终完成.如果十六进制编码缓冲区的长度不能被2整除,则最终字节将被解析为好像它前面加上0(例如,aaa被解释为aa0a).

如果十六进制可能格式错误(例如用户输入),请在调用此方法之前检查其长度并处理错误,例如：

const missingLetter = 'abc';
if(missingLetter.length % 2 === 0){
  throw new Error(`The string "${missingLetter}" is not divisible by 2.`)
}
fromHexString(missingLetter);