父组件中如何处理子组件内点击事件

class Model { 
  value: string = '' 
} 
 
@Entry 
@Component 
struct EntryComponent { 
  test() { 
    console.log('testTag test in my component'); 
  } 
 
  build() { 
    Column() { 
      MyComponent({ title: { value: 'Hello World 2' }, 
        count: 7, 
        click: this.test }) //初始化时传递定义的方法 
    } 
  } 
} 
 
@Component 
struct MyComponent { 
  @State title: Model = { value: 'Hello World' } 
  @State count: number = 0 
  click: () => void = () => { 
  }; 
  private toggle: string = 'Hello World' 
  private increaseBy: number = 1 
 
  build() { 
    Column() { 
      Text(`${this.title.value}`).fontSize(30) 
      Button(`Click to increase count=${this.count}`) 
        .margin(20) 
        .onClick(() => { 
          // 修改内部状态变量count 
          this.count += this.increaseBy 
          this.click(); 
        }) 
    } 
  } 
}