问：如何将以下observable转换为promise，以便我可以用.then(…)调用它？
我希望转换为承诺的方法：
this._APIService.getAssetTypes().subscribe(
assettypes => {
this._LocalStorageService.setAssetTypes(assettypes);
},err => {
this._LogService.error(JSON.stringify(err))
},() => {}
);
getAssetTypes() {
var method = "assettype";
var url = this.apiBaseUrl + method;
return this._http.get(url,{})
.map(res => <AssetType[]>res.json())
.map((assettypes) => {
assettypes.forEach((assettypes) => {
// do anything here you might need....
});
return assettypes;
});
}
谢谢！
import 'rxjs/add/operator/toPromise';
import 'rxjs/add/operator/map';
...
this._APIService.getAssetTypes()
.map(assettypes => {
this._LocalStorageService.setAssetTypes(assettypes);
})
.toPromise()
.catch(err => {
this._LogService.error(JSON.stringify(err));
});
