angular-cli for angular2如何加载环境变量

Question

我是angular-cli的新手,想要通过env为我的api服务调用加载url.例如

local: http://127.0.0.1:5000
dev: http://123.123.123.123:80
prod: https://123.123.123.123:443

例如在environment.prod.ts中

我假设这个:

export const environment = {
  production: true
  "API_URL": "prod: https://123.123.123.123:443"
};

但是从angular2,我如何调用以便获得API_URL？

例如

this.http.post(API_URL + '/auth', body, { headers: contentHeaders })
      .subscribe(
        response => {
          console.log(response.json().access_token);
          localStorage.setItem('id_token', response.json().access_token);
          this.router.navigate(['/dashboard']);
        },
        error => {
          alert(error.text());
          console.log(error.text());
        }
      );
  } 

谢谢

Answer 1

如果你看一下angular-cli生成的项目的根,你会在main.ts中看到:

import { environment } from './environments/environment';

要获取api URL,您只需在服务标头中执行相同操作即可.

环境路径取决于与环境文件夹相关的服务位置.对我来说,它的工作原理如下:

import { Http, Response } from '@angular/http';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { environment } from '../../environments/environment';

@Injectable()
export class ValuesService {
    private valuesUrl = environment.apiBaseUrl + 'api/values';
    constructor(private http: Http) { }

    getValues(): Observable<string[]> {
        return this.http.get(this.valuesUrl)
        .map(this.extractData)
        .catch(this.handleError);
    }

    private extractData(res: Response) {
        let body = res.json();
        return body || { };
    }

    private handleError(error: any) {
        let errMsg = (error.message) ? error.message :
        error.status ? `${error.status} - ${error.statusText}` : 'Server error';
        console.error(errMsg);
        return Observable.throw(errMsg);
    }
}

Answer 2

在Angular 4.3发布后,我们有可能使用HttpClient拦截器.这种方法的优点是避免导入/注入API_URL是api调用的所有服务.

有关更详细的答案,请访问/sf/answers/3174618331/