Javascript Angular和TypeScript：我应该如何处理这个问题

我有一个关于如何处理角度异步调用的问题

我正在从控制器调用服务中的以下两个方法，以获取一个对象，即“categoryInfo”

如何让以下方法返回categoryInfo并正确打印

调用程序（在控制器中）调用这两个方法↓

console.log(this.service.getLargeCategoryList()); ←※Prints out as "undefined"

public getLargeCategoryList(): any {
            console.log('Inside getLargeCategoryList');
            this.getCategoryInfoList('', ServiceUrls.URL_FOR_TOP_CATEGORY)
                .then((data) => {
                var categoryInfo: ILCategoryInfoRes[] = data.categoryInfo;
                return categoryInfo;　←※Appears to be skipped
            }, function (data) {
                    console.log(data);
                    alert('Error');
                    return null;
                });
            console.log('Coming out of getLargeCategoryList');
        }

private getCategoryInfoList(parameter: any, serviceUrl: string): ng.IPromise<any> {

                var def = this.qService.defer();

                this.httpService({
                        method: 'POST',
                        url: serviceUrl,
                        data: parameter
                }).success(function (data: any, status, headers, config) {
                     //Success
                    var categoryInfo: ILCategoryInfoRes[];
                    var statusInfo: IStatus[];

                    //categoryInfo = data.categoryInfo;
                    statusInfo = data.status;

                    if (statusInfo[0].statusCode == '000') {
                        def.resolve(data);
                    } else {
                        def.resolve(statusInfo);
                    }
                 }).error(function (data, status, headers, config){
                     //Error 
                    def.reject("Failed");
                 });
                return def.promise;
            }

方法1↓

console.log(this.service.getLargeCategoryList()); ←※Prints out as "undefined"

public getLargeCategoryList(): any {
            console.log('Inside getLargeCategoryList');
            this.getCategoryInfoList('', ServiceUrls.URL_FOR_TOP_CATEGORY)
                .then((data) => {
                var categoryInfo: ILCategoryInfoRes[] = data.categoryInfo;
                return categoryInfo;　←※Appears to be skipped
            }, function (data) {
                    console.log(data);
                    alert('Error');
                    return null;
                });
            console.log('Coming out of getLargeCategoryList');
        }

private getCategoryInfoList(parameter: any, serviceUrl: string): ng.IPromise<any> {

                var def = this.qService.defer();

                this.httpService({
                        method: 'POST',
                        url: serviceUrl,
                        data: parameter
                }).success(function (data: any, status, headers, config) {
                     //Success
                    var categoryInfo: ILCategoryInfoRes[];
                    var statusInfo: IStatus[];

                    //categoryInfo = data.categoryInfo;
                    statusInfo = data.status;

                    if (statusInfo[0].statusCode == '000') {
                        def.resolve(data);
                    } else {
                        def.resolve(statusInfo);
                    }
                 }).error(function (data, status, headers, config){
                     //Error 
                    def.reject("Failed");
                 });
                return def.promise;
            }

方法2↓

console.log(this.service.getLargeCategoryList()); ←※Prints out as "undefined"

public getLargeCategoryList(): any {
            console.log('Inside getLargeCategoryList');
            this.getCategoryInfoList('', ServiceUrls.URL_FOR_TOP_CATEGORY)
                .then((data) => {
                var categoryInfo: ILCategoryInfoRes[] = data.categoryInfo;
                return categoryInfo;　←※Appears to be skipped
            }, function (data) {
                    console.log(data);
                    alert('Error');
                    return null;
                });
            console.log('Coming out of getLargeCategoryList');
        }

private getCategoryInfoList(parameter: any, serviceUrl: string): ng.IPromise<any> {

                var def = this.qService.defer();

                this.httpService({
                        method: 'POST',
                        url: serviceUrl,
                        data: parameter
                }).success(function (data: any, status, headers, config) {
                     //Success
                    var categoryInfo: ILCategoryInfoRes[];
                    var statusInfo: IStatus[];

                    //categoryInfo = data.categoryInfo;
                    statusInfo = data.status;

                    if (statusInfo[0].statusCode == '000') {
                        def.resolve(data);
                    } else {
                        def.resolve(statusInfo);
                    }
                 }).error(function (data, status, headers, config){
                     //Error 
                    def.reject("Failed");
                 });
                return def.promise;
            }

private getCategoryFolist（参数：any，serviceUrl:string）：ng.IPromise{
var def=this.qService.defer（）；
这个.httpService({
方法：“POST”，
url:serviceUrl，
数据：参数
}).success（函数（数据：任意、状态、标题、配置）{
//成功
var categoryInfo:ILCategoryInfoRes[]；
var statusInfo:IStatus[]；
//categoryInfo=data.categoryInfo；
statusInfo=data.status；
如果（状态信息[0]。状态代码==“000”）{
解析（数据）；
}否则{
定义解析（状态信息）；
}
}).error（函数（数据、状态、标题、配置）{
//错误
定义拒绝（“失败”）；
});
回报承诺；
}

您需要从该函数中返回承诺：

public getLargeCategoryList(): any {
  console.log('Inside getLargeCategoryList');
  return this.getCategoryInfoList('', ServiceUrls.URL_FOR_TOP_CATEGORY)
    .then((data) => {
      var categoryInfo: ILCategoryInfoRes[] = data.categoryInfo;
      return categoryInfo;　←※Appears to be skipped
    }, function (data) {
      console.log(data);
      alert('Error');
      return null;
    });
  console.log('Coming out of getLargeCategoryList');
}

并像返回承诺一样处理它，而不是返回值，因为它是一个异步操作：

this.service.getLargeCategoryList()
  .then((data) => {
    console.log(data);
  }):

---

函数

getLargeCategoryList

不返回任何内容。

返回categoryInfo

只是从promise success处理程序返回，而不是从

getLargeCategoryList

如何实现这一点？我添加了一个答案，解释了我所说的内容