@ObservedV2的类实例目前不支持使用JSON.stringify进行序列化。

import  { plainToClass } from "class-transformer";
@ObservedV2
class Son {
  @Trace age: number = 100;
}
class Father {
  son: Son = new Son();
}
@Entry
@Component
struct Index {
  father: Father = new Father();
  aboutToAppear(): void {
    let a = JSON.stringify(this.father);
    let b: Father = plainToClass(Father,this.father);
    //{"son":{"__ob_age":100}}替换成{"son":{"age":100}}
    console.log(JSON.stringify(convertKeysToCamelCase(this.father)))
  }

  build() {
    Column() {
      // 当点击改变age时，Text组件会刷新
      Text(`${this.father.son.age}`)
        .onClick(() => {
          this.father.son.age++;
        })
    }
  }
}

// utils.ets
export function underscoreToCamelCase(underscoreString:string):string {
  // 捕获__ob_替换成''
  return underscoreString.replace(/(__ob_)/g, (match:string, letter:string):string=> {
    console.log(letter)
    return '';
  });
}
export function convertKeysToCamelCase(obj:ESObject):ESObject {
  if (obj && typeof obj === 'object') {
    const newObj:ESObject = {};
    Object.keys(obj).forEach((key)=> {
    if (obj.hasOwnProperty(key)) {
      const newKey = underscoreToCamelCase(key);
      newObj[newKey] = convertKeysToCamelCase(obj[key]);
    }
  })
  return newObj;
 } else {
  return obj;
 }
}