HTTP observable 返回 undefined/null

Question

我已经创建了供应商页面，我正在发帖并在其中收到请求

这是我的返回可观察的服务

post(url: string,data:any): Observable<any>{

   return this.http.post(this.configurator.restServerBaseUrl+url,data)
    .map((result:Response)=> {
      result.json()
    })
  }

这是我的组件代码

 submit(){
    this.rest.post('/validateUser',validateUserObj)
    .subscribe((result)=>{
      this.logger.debug("checking data of success " +JSON.stringify(result));

    });
  }
}

我的结果是 undefined

in my services if i map like this it works fine .map((result:Response)=>result.json())

如果我应用括号，我将变得不确定。

can some one help me in understand the observable i have checked in angula.io but i am feeling difficult to understand there

Answer 1

简写形式隐式返回expression的结果

(param) => expression;

带括号的长格式支持多条语句，但你必须显式return

(param) => { 
  let x = this.doSomething();
  return x; 
}