如何判断HAP是否安装

import bundleManager from '@ohos.bundle.bundleManager'; 
import hilog from '@ohos.hilog'; 
let bundleFlags = bundleManager.BundleFlag.GET_BUNDLE_INFO_DEFAULT; 
try{ 
  bundleManager.getBundleInfoForSelf(bundleFlags).then((data) => { 
    hilog.info(0x0000, 'testTag', 'getBundleInfoForSelf successfully. Data: %{public}s', JSON.stringify(data)); 
  }).catch(err => { 
    hilog.error(0x0000, 'testTag', 'getBundleInfoForSelf failed. Cause: %{public}s', err.message); 
  }); 
}catch(err){ 
  hilog.error(0x0000, 'testTag', 'getBundleInfoForSelf failed: %{public}s', err.message); 
}