interface回调如何调用

@Observed 
export class TestPlanCommonModel { 
  serviceType: string = '' 
  // toggle是否勾选 
  isOn: boolean = true 
  constructor(isOn: boolean, serviceType: string) { 
    this.isOn = isOn 
    this.serviceType = serviceType 
  } 
} 
 
@Observed 
export class TestArray{ 
  testPlanCommonModel: TestPlanCommonModel 
 
  constructor(testPlanCommonModel: TestPlanCommonModel) { 
    this.testPlanCommonModel = testPlanCommonModel 
  } 
} 
 
 
@Entry 
@Component 
struct Test { 
  @State isOnState: boolean = false; 
  @State listA: TestPlanCommonModel[] = [ new TestPlanCommonModel(true, '1'), new TestPlanCommonModel(true, '2'), new TestPlanCommonModel(false, '3'), new TestPlanCommonModel(false, '1'), new TestPlanCommonModel(false, '1')] 
 
  // @State listA: boolean[] = [true, true, true, false, false] 
 
  build() { 
    Column() { 
      Test1({ isOnState: this.isOnState, listA: this.listA }) 
      TestPlanItem({ listA: this.listA }) 
      Button('打印：').onClick(() => { 
        for (let i = 0; i < this.listA.length; i++) { 
          console.log("打印：" + JSON.stringify(this.listA[i])) 
        } 
      }) 
    } 
  } 
} 
 
@Component 
struct Test1 { 
  @Link isOnState: boolean 
  @Link listA: TestPlanCommonModel[] 
 
  build() { 
    Column({ space: 10 }) { 
      Toggle({ type: ToggleType.Switch, isOn: true }) 
        .selectedColor('#007DFF') 
        .switchPointColor('#FFFFFF') 
        .onChange((isOn: boolean) => { 
          console.log("点击总开关-修改listA的所有isOn属性为" + isOn) 
          for (let i = 0; i < this.listA.length; i++) { 
            this.listA[i].isOn = isOn 
          } 
        }) 
      Divider() 
 
    } 
  } 
} 
 
import { MyInterDemo } from '../interface/MyInterDemo' 
 
@Entry 
@Component 
struct TestInterfacePage { 
 
  testInter(inter: MyInterDemo) { 
    console.log('testInter'); 
    inter.func_1(); 
    inter.func_2(); 
    inter.func_3('hello'); 
  } 
 
  build() { 
    Row() { 
      Column() { 
        Button('Test interface') 
          .onClick(() => { 
            let demo: MyInterDemo = { 
              func_1: () => { 
                console.log('func_1'); 
              }, 
              func_2: () => { 
                console.log('func_2'); 
                return true; 
              }, 
              func_3: (arg: string) => { 
                console.log('func_3:' + arg); 
              } 
            } 
            this.testInter(demo); 
          }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
} 
export interface MyInterDemo { 
  func_1: () => void; 
  func_2: () => boolean; 
  func_3: (arg: string) => void; 
}