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[dart/zh-cn]: Example23 class When used as a mixin, it throws an error. #5416

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[dart/zh-cn]: Example23 class When used as a mixin, it throws an error. #5416

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3 changes: 2 additions & 1 deletion zh-cn/dart.md
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Expand Up @@ -327,8 +327,9 @@ example22() {
// Mixin 主要是用来和辅助的类共享方法的，
// 这样单一继承就不会影响代码复用。
// Mixin 声明在类定义的 "with" 关键词后面。
// 在 Dart 2.1 之前：把一个普通的、没有构造函数的 class 当作 mixin 使用。新项目推荐使用 mixin
class Example23A {}
class Example23Utils {
mixin Example23Utils {
addTwo(n1, n2) {
return n1 + n2;
}
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