@（'at sign'）符号在飞镖中是什么意思？

Question

@（at 符号）在 dart 中是什么意思？

@immutable
@JsonSerializable(createToJson: false)
class ClassA  {

  @JsonKey(name: 'field_1')
  final int field1;
  @JsonKey(name: 'field_2')
  final String field2;

  const ClassA(this.field1, this.field2);

  factory ClassA.fromJson(Map<String, dynamic> json) => _$ClassAFromJson(json);
}

Answer 1

@ 符号表示 Metadata annotation

Use metadata to give additional information about your code. A metadata annotation begins with the character @, followed by either a reference to a compile-time constant (such as deprecated) or a call to a constant constructor.

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@（'at sign'）符号在飞镖中是什么意思？

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