如何处理错误和异常？

Question

如何处理错误和异常？

Answer 1

//EntryAbility.ets
onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
  hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate');
  //创建异常发生时的回调
  let observer: errorManager.ErrorObserver = {
    //onUnhandledException 回调，回调返回的对象为一个字符串
    onUnhandledException(errorMsg) {
      console.log('testTagonUnhandledException, errorMsg: ', errorMsg);
    },
    //onException 回调，回调返回的对象是一个包装好的对象，存在一些属性
    onException(errorObj) {
      console.log('testTagonException, name: ', errorObj.name);
      console.log('testTagonException, message: ', errorObj.message);
      if (typeof(errorObj.stack) ==='string') {
        console.log('testTagonException, stack: ', errorObj.stack);
      }
    }
    //以上两种回调唯一区别在于回调返回值是否封装为对象，无功能类的区别
  };
  let observerId = -1;
  //开启监听异常
  observerId = errorManager.on('error', observer);
}
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