Angular TypeScript 2.6.1错误TS2554:应为2-3个参数，但得到1个

我在angularjs5中有这个错误

src/app/search/job.search.ts（17,10）：错误TS2554:应为2-3个参数，但得到1个。 src/app/search/job.search.ts（21,10）：错误TS2554:应为2-3个参数，但得到1个

这是我的代码：

import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';

import 'rxjs/add/operator/map';

@Injectable()

export class JobSearch{

constructor(private _http: Http){}

private _jobListUrl = 'https://api.shiftjobapp.com/api/v3/job_list?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjIzMjQsImlzcyI6Imh0dHA6XC9cL2FwaS5zaGlmdGpvYmFwcC5jb21cL2FwaVwvdjNcL2F1dGhlbnRpY2F0ZV9qb2Jfc2Vla2VyIiwiaWF0IjoxNTEyMzY3OTg1LCJleHAiOjE1MTMyMzE5ODUsIm5iZiI6MTUxMjM2Nzk4NSwianRpIjoiMWQ4NmZkZDYzZDI3YmFiODE0NjA5OTRjOGZhYjI4NTUifQ.3EzNsu154q7a6xFuhQSakBlC-rj1D0HZqLiuwHblNao';

private _jobDetailsUrl = 'https://api.shiftjobapp.com/api/v3/job_detailed?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjIzMjQsImlzcyI6Imh0dHA6XC9cL2FwaS5zaGlmdGpvYmFwcC5jb21cL2FwaVwvdjNcL2F1dGhlbnRpY2F0ZV9qb2Jfc2Vla2VyIiwiaWF0IjoxNTEyMzY3OTg1LCJleHAiOjE1MTMyMzE5ODUsIm5iZiI6MTUxMjM2Nzk4NSwianRpIjoiMWQ4NmZkZDYzZDI3YmFiODE0NjA5OTRjOGZhYjI4NTUifQ.3EzNsu154q7a6xFuhQSakBlC-rj1D0HZqLiuwHblNao';   

getJobs(){
    return this._http.post(this._jobListUrl)
        .map((response:Response) => response.json());
}
getJobDetails(){
    return this._http.post(this._jobDetailsUrl)
        .map((response:Response) => response.json());
}

}

---

POST

请求需要数据

例如，见

  addHero (hero: Hero): Observable<Hero> {
    return this.http.post<Hero>(this.heroesUrl, hero, httpOptions).pipe(
      tap((hero: Hero) => this.log(`added hero w/ id=${hero.id}`)),
      catchError(this.handleError<Hero>('addHero'))
    );
  }

addHero（英雄：英雄）：可见{
返回this.http.post（this.heroesUrl，hero，httpOptions）.pipe(
点击（（hero:hero）=>this.log（`added hero w/id=${hero.id}`）），
catchError（this.handleError（'addHero'））
);
}

从