HarmonyOS 鸿蒙Next @State的观测问题求解，各位大佬能解答一下小弟的疑惑吗

HarmonyOS 鸿蒙Next @State的观测问题求解，各位大佬能解答一下小弟的疑惑吗

以下两段代码为什么会有不同的结果？

class Son {
  son: string = '000';
  constructor(son: string) {
    this.son = son;
  }
}

class Parent {
  son: Son = new Son('111');
}

[@Entry](/user/Entry)
[@Component](/user/Component)
struct Test {
  [@State](/user/State) son: Son = new Son('222');
  [@State](/user/State) parent: Parent = new Parent();

  aboutToAppear(): void {
    this.parent.son = this.son;
  }
  build() {
    Column() {
      Text(`${this.son.son}`);
      Text(`${this.parent.son.son}`);
      Button('change')
        .onClick(() => {
          this.parent.son.son = '333';
        })
    }
  }
}
<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 4px; right: 8px; font-size: 14px;">复制</button>

结果是

class Son {
  son: string = '000';
  constructor(son: string) {
    this.son = son;
  }
}
class Parent {
son: Son = new Son(‘111’);
}
@Entry
@Component
struct Test {
@State son: Son = new Son(‘222’);
@State parent: Parent = new Parent();
aboutToAppear(): void {
}
build() {
Column() {
Text(<span class="javascript"><span class="javascript">${</span><span class="hljs-keyword"><span class="javascript"><span class="hljs-keyword">this</span></span></span><span class="javascript">.son.son}</span></span>);
Text(<span class="javascript"><span class="javascript">${</span><span class="hljs-keyword"><span class="javascript"><span class="hljs-keyword">this</span></span></span><span class="javascript">.parent.son.son}</span></span>);
Button(‘change’)
.onClick(() => {
this.parent.son = this.son;
this.parent.son.son = ‘333’;
})
}
}
}
 

结果是