HarmonyOS 用@Watch来订阅数据变化时候，数据中每个属性变化都会导致调用这个@Watch方法

@Observed 
class tmp { 
 count: number = 0 
 name: string = 'ahah' 
} 
 
@Component 
struct watchShuXingChild { 
 @Link @Watch('exampleWatch') exampleChild: tmp 
 @State @Watch('idWatch') idChild: Length = 0; 
 @State countChild: Length = 0 
 
 exampleWatch(propName: string): void { 
  console.log('exampleWatch:', this.exampleChild.count.toString()); 
  this.idChild = this.exampleChild.count 
 } 
 
 idWatch(propName: string): void { 
  console.log('idWatch'); 
  this.countChild = this.idChild 
 } 
 
 build() { 
  Column() { 
   Text(`子组件id${this.countChild}`).fontSize(30) 
  } 
 } 
} 
 
@Entry 
@Component 
struct watchShuXing { 
 @State example: tmp = new tmp(); 
 @State idR: number = 0 
 
 build() { 
  Column() { 
   Text(`改变属性${this.example.count}`) 
    .onClick(() => { 
     this.example.count++ 
    }).fontSize(30) 
 
   Text(`改变属性name${this.example.name}`) 
    .onClick(() => { 
     this.idR++ 
     this.example.name = this.example.name + this.idR 
    }).fontSize(30) 
   watchShuXingChild({ exampleChild: this.example }) 
  } 
 } 
}
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