Javascript:将十六进制编码的字符串转换为十六进制字节

function hexStringToByteArray(hexString) {
  var byteArray = [];
  for (var i = 0; i < hexString.length; i += 2) {
    byteArray.push(parseInt(hexString.substr(i, 2), 16));
  }
  return byteArray;
}

function hexStringToHexBytes(hexString) {
  var byteArray = hexStringToByteArray(hexString);
  var buffer = new ArrayBuffer(byteArray.length);
  var dataView = new DataView(buffer);
  for (var i = 0; i < byteArray.length; i++) {
    dataView.setUint8(i, byteArray[i]);
  }
  return new Uint8Array(buffer);
}

var hexString = "48656c6c6f20576f726c64";
var hexBytes = hexStringToHexBytes(hexString);
console.log(hexBytes); // 输出: Uint8Array [ 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100 ]