HarmonyOS 如何判断联合类型的具体类型

可以通过instanceof来判断实体类型

参考demo:

@Entry
@Component
struct TestPage1 {
  @State list: Array<Object> = [new Cat(), new Dog()]

  build() {
    Row() {
      Column() {
        ForEach(this.list, (item: Object) => {
          if (item instanceof Cat) {
            Text("this is Cat")
          } else if (item instanceof Dog) {
            Text("this is Dog")
          }
        })
      }.width('100%')
    }.height('100%')
  }
}

class Cat {
}

class Dog {
}
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