HarmonyOS 关于@Watch监听状态问题

@State @Watch('attrChange')  
attr: Attr = new Attr(new Start())  
attrChange() {  
  console.log('attr has changed:' + JSON.stringify(this.attr))  
}  
build() {  
  Column() {  
    Button('test').onClick((event: ClickEvent) => {  
      console.log('000:' + JSON.stringify(this.attr))  
      new Action().do(this.attr)  
      console.log('111:' + JSON.stringify(this.attr))  
    })  
  }  
  .height('100%')  
  .width('100%')  
}  
class Action {  
  do(attr: Attr) {  
    const newStart = new Start()  
    newStart.info = {  
      'title': 'fadshf'  
    }  
    attr.start = newStart  
  }  
}  
class Attr {  
  name: string = 'kac'  
  age: number = 18  
  info: Record<string, string> = {  
    'title': 'www',  
    'msg': 'qqq',  
  }  
  start: Start  
  constructor(start: Start) {  
    this.start = start  
  }  
}  
@Observed  
class Start {  
  road: string = 'ttt'  
  color: string = 'yellow'  
  info: Record<string, string> = {  
    'aaaa': '1111',  
    'bbbb': '22222'  
  }  
}