HarmonyOS 获取Resource中的value问题

getString(){ 
  try { 
    let str = getContext(this).resourceManager.getStringSync($r('app.string.app_name').id); 
    console.log("str::"+str) 
  } catch (error) { 
    let code = (error as BusinessError).code; 
    let message = (error as BusinessError).message; 
    console.error(`getStringSync failed, error code: ${code}, message: ${message}.`); 
  } 
}