你没有做错任何事.Snoop 显示颜色的完整十六进制代码，包括 alpha 通道.#FFDDDDDD 与 #DDDDDD 完全相同，因为默认情况下 alpha 为 100%.

You're not doing anything wrong. Snoop shows the full hex codes, including the alpha channel, for colors. #FFDDDDDD is exactly the same as #DDDDDD, since the alpha is 100% by default.