HarmonyOS 自定义组件的私有属性，外部通过构造函数初始化，还能实例化

@Component  
export struct NavigationBar {  
  @State title: string = ""  
  @State leftImage: Resource | null = null  
  @State rightImage: Resource | null = null  
  private rightItemCallBack?: () => void  
  constructor(title: string) {  
    super()  
    this.title = title  
  }  
  set(ccc : () => void){  
    this.rightItemCallBack = ccc  
  }  
  build() {  
  }  
}

import { NavigationBar } from '../Test/conTest';  
@Entry  
@Component  
struct WebComponent {  
  build() {  
    Column() {  
NavigationBar({title:"wwwww",rightItemCallBack : () =>{  
      }})  
    }  
  }  
}