https://dart.dev/guides/language/ effective-dart/usage#avoid-using-curly-braces-in-interpolation-when-not-needed effective-dart/usage#avoid-using-curly-braces-in-interpolation-when-not-needed表示在不需要时避免在插值中使用花括号。如果您\xe2\x80\x99 插入一个简单标识符，后面没有紧跟着更多字母数字文本，则应省略 {}。
\n\n除了不需要进行插值之外，这样做还有什么问题吗？
\n\n指南说这很好：
\n\n\'Hi, $name!\'\n "Wear your wildest $decade\'s outfit."\n \'Wear your wildest ${decade}s outfit.\'\n指南说这很糟糕：
\n\n\'Hi, ${name}!\'\n "Wear your wildest ${decade}\'s outfit."\n