HarmonyOS 鸿蒙Next 单例模式的工具类，出现了两个实例

下面是给你提供一个线程安全的单例demo，可以参考一下：

import { ArkTSUtils } from '@kit.ArkTS';
// 声明当前模块为共享模块，只能导出可Sendable数据
“use shared”
// 共享模块，TestData全局唯一
@Sendable
export class TestData {
  private keyHandle: string = ‘0’;
  private count_: number = 0;
  private isLoadingShowing: boolean = false;
  lock_: ArkTSUtils.locks.AsyncLock = new ArkTSUtils.locks.AsyncLock()
  private static instance: TestData ;
  private constructor() {}
  public static getInstance(): TestData {
    if (TestData.instance == null) {
      TestData.instance = new TestData();
      console.debug('getInstance  new  ')
    }
    return TestData.instance ;
  }
  async getLoadingShowing(): Promise<boolean> {
    return this.lock_.lockAsync(() => {
      return this.isLoadingShowing;
    })
  }
  async setLoadingShowing(isShow:boolean){
    await this.lock_.lockAsync(() => {
      this.isLoadingShowing = isShow
    })
  }
  async getKeyHandle(): Promise<string> {
    return this.lock_.lockAsync(() => {
      return this.keyHandle;
    })
  }
  async setKeyHandle(keyHandle:string) {
    await this.lock_.lockAsync(() => {
      this.keyHandle = keyHandle;
    })
  }
  public async  getCount():Promise<number>  {
    return this.lock_.lockAsync(() => {
      return this.count_;
    })
  }
  public async increaseCount() {
    await this.lock_.lockAsync(() => {
      this.count_++;
    })
  }
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