我刚刚对Angular 4应用程序和构建工具进行了两次重要的升级：
> @ angular / core ^ 4.1.3 => ^ 4.2.4(和/ http,/ forms等)
> tslint ^ 5.3.2 => ^ 5.4.3
我有一个服务,声明这样的选项：
@Injectable()
export class WorkOrderService {
private headers: Headers = new Headers({ 'Content-Type': 'application/json' });
private options: RequestOptions = new RequestOptions(this.headers);
constructor(private http: Http) {}
/* Methods ... */
}
以上现在不再验证tslint,抛出以下错误：
error TS2559: Type ‘Headers’ has no properties in common with type ‘RequestOptionsArgs’.
源(@ angular / http interface.d.ts:43)显然允许Headers作为RequestOptionsArgs：
/**
* Interface for options to construct a RequestOptions,based on
* [RequestInit](https://fetch.spec.whatwg.org/#requestinit) from the Fetch spec.
*
* @experimental
*/
export interface RequestOptionsArgs {
url?: string | null;
method?: string | RequestMethod | null;
/** @deprecated from 4.0.0. Use params instead. */
search?: string | URLSearchParams | {
[key: string]: any | any[];
} | null;
params?: string | URLSearchParams | {
[key: string]: any | any[];
} | null;
headers?: Headers | null;
body?: any;
withCredentials?: boolean | null;
responseType?: ResponseContentType | null;
}
4.3 HttpClient的更新
原文链接：https://www.f2er.com/angularjs/143552.html在角度4.3中引入的与HttpClient兼容的新语法是：
import { HttpClient,HttpHeaders } from "@angular/common/http";
private _options = { headers: new HttpHeaders({ 'Content-Type': 'application/json' }) };
不再有RequestOptions：使用新的immutable HttpParams Map添加参数.
Pre 4.3 / Http
我刚刚注意到RequestOptions现在要求您将命名选项显式传递为对象,如：
headers: Headers = new Headers({ 'Content-Type': 'application/json' });
options: RequestOptions = new RequestOptions({ headers: this.headers });
