ArkTs解决循环引用的方式

TestClass.ets： 
export class A { 
  value: number = 1; 
} 
 
export class B { 
  value: number = 1; 
} 
 
export class C { 
  a: Object | null = null; 
  b: Object | null = null; 
} 
Index.ets: 
import {A, B, C} from ‘./TestClass’ 
 
let a = new A(); 
let b = new B(); 
 
let c = new C(); 
c.a = a; 
c.b = b;
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