HarmonyOS 自定义注解类的实现方案

ArkTS自定义注解与TS自定义注解实现方式一致，可以参考如下的aop demo：

@Entry
@Component
struct Page {
  @State message: string = 'Hello World';
  aboutToAppear() {
    this.demo('hello!!!')
  }
  build() {
    Flex() { }.backgroundColor(Color.Green).height('100%');
  }
  @MyDescriptor
  demo(param: string) {
    console.info('…' + param);
    return param;
  }
}
export function MyDescriptor(target: Object, key: string, descriptor: PropertyDescriptor): PropertyDescriptor {
  const originalMethod: Function = descriptor.value
  descriptor.value = (args: Object[]) => {
    console.info(`...Calling ${target.constructor.name} method ${key} with argument: ${args}`)
    const result: Object = originalMethod(args)
    console.info(`...Method ${key} returned: ${result}`)
    return result;
  }
  return descriptor;
}