Function defer

test/angular/1.6/angular.js:17273–17275

* @ngdoc method * @name ng.$q#defer * @kind function * * @description * Creates a `Deferred` object which represents a task which will finish in the future. * * @returns {Deferred} Returns a new instance of deferred.

()

   * @returns {Deferred} Returns a new instance of deferred.
   */
  function defer() {
    return new Deferred();
  }

  function Deferred() {
    var promise = this.promise = new Promise();