Javascript 函数在解析时返回承诺拒绝

我有一个

angularjs

控制器和工厂

因此，我的目的是根据promise结果管理所有消息错误。这意味着在检查resolve factory函数中的一些错误值后，在控制器中接收拒绝

我试着这样做，但不起作用：

factory.js

var mediaRecent;
function getMediaByUserName(user) {
  return $http.get('https://www.instagram.com/' + user + '/media')
    .then(function (response) {
      if (response.data.items.length === 0) {
        // I want here to cause a reject in the controller function
        return new Error('This user is not public');
      }
      mediaRecent = response.data.items;
    })
    .catch(function (error) {
      return new Error('There was a problem looking to that user');
    });
}

instagramFactory.getMediaByUserName(vm.name)
  .then(function () {
    $state.go('instagramMediaRecent');
  })
  .catch(function (error) {
    vm.error = error.message;
  });

controller.js

var mediaRecent;
function getMediaByUserName(user) {
  return $http.get('https://www.instagram.com/' + user + '/media')
    .then(function (response) {
      if (response.data.items.length === 0) {
        // I want here to cause a reject in the controller function
        return new Error('This user is not public');
      }
      mediaRecent = response.data.items;
    })
    .catch(function (error) {
      return new Error('There was a problem looking to that user');
    });
}

instagramFactory.getMediaByUserName(vm.name)
  .then(function () {
    $state.go('instagramMediaRecent');
  })
  .catch(function (error) {
    vm.error = error.message;
  });

---

事实上你打了两次电话给promise。因此，您只能在控制器或工厂中调用它

简单方法

工厂：

function getMediaByUserName(user) {
  return $http.get('https://www.instagram.com/' + user + '/media');
}

控制器：

instagramFactory.getMediaByUserName(vm.name)
  .then(function () {
    if (response.data.items.length === 0) {
      // I want here to cause a reject in the controller function
      return new Error('This user is not public');
    }
    var mediaRecent = response.data.items;
    $state.go('instagramMediaRecent');
  })
  .catch(function (error) {
    vm.error = new Error('There was a problem looking to that user');
  });

---

尝试抛出错误，而不是返回错误。