将二进制ArrayBuffer/TypedArray数据转换为十六进制字符串

function arrayBufferToHex(buffer) {
  const view = new Uint8Array(buffer);
  let hexString = '';
  
  for (let i = 0; i < view.length; i++) {
    const byte = view[i].toString(16);
    hexString += (byte.length === 1 ? '0' + byte : byte);
  }
  
  return hexString;
}

// 示例用法
const arrayBuffer = new ArrayBuffer(4);
const view = new Uint8Array(arrayBuffer);
view[0] = 0x12;
view[1] = 0x34;
view[2] = 0x56;
view[3] = 0x78;

const hexString = arrayBufferToHex(arrayBuffer);
console.log(hexString); // 输出：12345678