HarmonyOS 长时任务执行几秒后，自动关闭

let wantAgentInfo: wantAgent.WantAgentInfo = { 
  // 点击通知后，将要执行的动作列表 
  wants: [ 
    { 
      bundleName: "com.xxx.xxx", 
      abilityName: "EntryAbility" 
    } 
  ], 
  // 点击通知后，动作类型 
  actionType: wantAgent.OperationType.START_ABILITY, 
  // 使用者自定义的一个私有值 
  requestCode: 0, 
  // 点击通知后，动作执行属性 
  wantAgentFlags: [wantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG] 
}; 
try { 
  // 通过wantAgent模块下getWantAgent方法获取WantAgent对象 
  wantAgent.getWantAgent(wantAgentInfo).then((wantAgentObj: WantAgent) => { 
    try { 
      backgroundTaskManager.startBackgroundRunning(getContext(this), 
        backgroundTaskManager.BackgroundMode.TASK_KEEPING, wantAgentObj, ()=>{ 
          setInterval(()=>{console.log('success')},2200) 
        }) 
    } catch (error) { 
      console.error(`Operation startBackgroundRunning failed. code is ${(error as BusinessError).code} message is ${(error as BusinessError).message}`); 
    } 
  }); 
} catch (error) { 
  console.error(`Operation getWantAgent failed. code is ${(error as BusinessError).code} message is ${(error as BusinessError).message}`); 
}