HarmonyOS 子组件响应父组件的事件方法

@Entry  
@Component  
struct Index {  
  childClick(){  
    console.log('child click')  
  }  
  build() {  
    Column(){  
      Child({  
        childClick:this.childClick  
      })  
    }  
  }  
}  
@Component  
struct Child {  
  childClick = () => {}  
  build() {  
    Column(){  
      Button('child click').onClick(() => {  
        this.childClick()  
      })  
    }  
  }  
}