code: func (b *ByteBuf) ReadUInt16() (uint16, error) {
  	if b.Readable() < 2 {
  		return 0, io.ErrShortBuffer
  	}
  
  	b.readerIndex += 2
  	return Byte2UInt16(b.buf[b.readerIndex-2 : b.readerIndex]), nil
  }
docs: // ReadUInt16 get uint16 value from buf