HarmonyOS 关于taskpool的问题

export class MYHttpClient { 
  let isSyning = false; 
  private static instance: MYHttpClient; 
  private constructor() { 
  } 
  public static getInstance() { 
    if (!MYHttpClient.instance) { 
      MYHttpClient.instance = new MYHttpClient(); 
    } 
    return MYHttpClient.instance; 
  } 
}