如何在ArkTS使用Reflect正确绑定this指针

class Proxy { 
  private a = 'a' 
 
  get getA() { 
    return () => { 
      return this.a 
    }; 
  } 
 
  set setA(a: string) { 
    this.a = a 
  } 
} 
 
export function testInvoke() { 
  const proxy = new Proxy(); 
  const fn: Function = Reflect.get(proxy, 'getA', proxy); 
  console.log(fn()); 
}