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我的飞镖是Dart SDK version: 2.10.4 (stable) (Wed Nov 11 13:35:58 2020 +0100) on "windows_x64",但我不能使用padLeft(),有人告诉我为什么吗?接下来我能做什么?
Dart SDK version: 2.10.4 (stable) (Wed Nov 11 13:35:58 2020 +0100) on "windows_x64"
padLeft()
我在 Dart 方面没有经验,但不toString应该是一种方法?如果是这样,您必须在其名称后添加括号,如下所示:id.toString().
toString
id.toString()