UTF-8 UTF-32/UCS-4 论述正确。
错误1: UCS-16 big endian 起头是 FE FF UCS-16 little endian 起头是 FF FE
错误2: "连通"保存为 UCS-16 big endian 后为: FE FF 8F DE 90 1A
"连通"保存为 UCS-16 little endian 后为: FF FE DE 8F 1A 90