HarmonyOS 子组件调用父组件的方法demo

子组件调用父组件的方法，父组件直接将定义好的方法传递过去即可

@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()
      })
    }
  }
}