在Angular2中同时获取多个HTTP资源

我可以http.get使用以下代码处理单个可观察的结果:

http.get('/customers/1')
        .map((res: Response) => res.json())
        .subscribe(customer => this.customer = customer);

现在我有一个资源ID列表var list:number[] = [1, 4, 7];,我希望能够发送所有资源的请求,并将所有已解析的项目分配给我的数组customers => this.customers = customers.

Rx.Observable.forkJoin可以做到这一点.

首先导入Obserable&forkJoin:

import {Observable} from 'rxjs/Observable';
import 'rxjs/add/observable/forkJoin';

或全部导入

import {Observable} from 'rxjs/Rx';

现在加入所有可观察者forkJoin:

// a set of customer IDs was given to retrieve
var ids:number[] = [1, 4, 7];

// map them into a array of observables and forkJoin
Observable.forkJoin(
    ids.map(
        i => this.http.get('/customers/' + i)
            .map(res => res.json())
    ))
    .subscribe(customers => this.customers = customers);