Flutter Color的使用

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4种定义Color的方式:

Color c = const Color(0xFF42A5F5);//16进制的ARGB
Color c = const Color.fromARGB(0xFF, 0x42, 0xA5, 0xF5);
Color c = const Color.fromARGB(255, 66, 165, 245);
Color c = const Color.fromRGBO(66, 165, 245, 1.0);//opacity:不透明度

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