Angularjs 承诺拒绝链

javascript
var getUserData = function() {
  var deferred = $q.defer();
  $http.get('/api/user')
    .then(function(response) {
      deferred.resolve(response.data);
    })
    .catch(function(error) {
      deferred.reject(error);
    });
  return deferred.promise;
};
var processData = function(userData) {
  var deferred = $q.defer();
  // 处理数据逻辑...
  if (processedData) {
    deferred.resolve(processedData);
  } else {
    deferred.reject('Error processing data');
  }
  return deferred.promise;
};
getUserData()
  .then(function(userData) {
    return processData(userData);
  })
  .then(function(processedData) {
    // 处理最终结果...
  })
  .catch(function(error) {
    // 处理错误...
  });