code: public static int bytesHighFirstToInt(byte[] bytes, int start)
      {
          int num = bytes[start + 3] & 0xFF;
          num |= ((bytes[start + 2] << 8) & 0xFF00);
          num |= ((bytes[start + 1] << 16) & 0xFF0000);
          num |= ((bytes[start] << 24) & 0xFF000000);
          return num;
      }
docs: 字节数组和整型的转换，高位在前，适用于读取writeInt的数据
  
  @param bytes 字节数组
  @return 整型