Angular 5: 运行 注入前的构造函数

Question

我有一个包含全局变量的文件：

@Injectable()
export class Globals {
  public baseURL:string;
  public loginURL:string;
  public proxyURL:string;
  public servicesURL:string;

  constructor(platformLocation: PlatformLocation) {
    this.baseURL = (platformLocation as any).location.href;
    this.loginURL = this.baseURL + 'rest/login';
    this.proxyURL = this.baseURL + 'rest/proxy';
    this.servicesURL = this.baseURL + 'rest/serviceRegistry';
  }
}

目前我的 API-调用失败，因为尚未设置变量。有没有办法只在构造函数为 运行 时注入此服务，或者我必须使用 Observables？

Answer 1

为什么不把这些放在 environment.ts 中？您还可以为 prod、dev 等保留不同的环境

export const environment = {
  production: false,
  envName: 'local',
  baseUrl: '',
  proxyUrl: '',
  servicesUrl: ''
};

并为您服务：

import { Injectable } from '@angular/core';
import { environment } from '../../environments/environment';
import { HttpClient } from '@angular/common/http';

@Injectable()
export class MyService {

  constructor(private http: HttpClient) { }

  getData() {
    return this.http.get(`${environment.server}/remaining/path`)
  }

}

Answer 2

本身没有解决。我现在是这样使用它的：

@Injectable()
export class Globals {
  /** API URLS */
  public baseURL:string = '';
  public loginURL:string = 'rest/login';
  public proxyURL:string = 'rest/proxy';
  public servicesURL:string = 'rest/serviceRegistry';
}