HarmonyOS ArkTS如何判断Object类型？

@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{}