1.定义参数

class ReceiveBook extends StatefulWidget {
  final String giftBookId;
  final String giftBookName;
  const ReceiveBook({required this.giftBookId,required this.giftBookName});
  @override
  ReceiveBookPageState createState() => ReceiveBookPageState();
}

2.传入参数

ReceiveBook(giftBookId: giftBookId,giftBookName:giftBookName,);

3.使用参数

widget.giftBookId
widget.giftBookName