为什么cookie服务返回错误的值？

Question

我正在使用Angular 6设置一些API调用，并使用ngx cookieService来访问和存储cookie。我想从我的API获取访问令牌，并在另一个服务中发送get请求时将其用作标头。这是我的登录服务中的功能：

getData()  {
    return this.http.post(this.base_URL + "web_app/login/", JSON.stringify(this.login))   

  .subscribe(response=>{    
     this.access_token = response['access_token'];
     console.log("received token " + this.access_token)
     this.cookieService.set( 'access_token', this.access_token );
     this.cookieValue = this.cookieService.get('access_token');
     console.log("set cookie value" + this.cookieValue);

    } }

这是其他服务：

farmAccess(){
    let headers = new HttpHeaders();
    this.cookieValue = this.cookieService.get('access_token');
    headers.append('access_token', this.cookieValue);
    console.log("retrieved cookie value" + this.cookieValue);
    return this.http.get(this.baseURL + 'web_app/farm_access/', {headers})
.subscribe(
res => console.log(res),
         // msg => console.error(`Error: ${msg.status} ${msg.statusText}`
        )
   }; 

我将访问令牌存储为cookie，并希望在farmAccess服务中访问它。但是，这不起作用。比较两个cookie，这是控制台上的内容：

这是我调用函数的地方：

 ngOnInit(): void {
this.data = this.login.getData();
this.farmAccessdata = this.getFarmAccess.farmAccess();

}

我检查了控制台中的cookie，它显示了access_token的正确值。那么为什么farmAccess服务拉错了价值呢？谢谢你的帮助！

编辑：看起来函数运行不正常。如何让它们按我想要的顺序运行？

Answer 1

按如下所示更改登录服务功能

ngOnInit(): void {
    this.data = this.login.getData().subscribe(response =>{

        // Set the token & cookie from the component. Changes access_token ==> login.access_token
        // You may also need to inject cookieService in component as well
        this.login.access_token = response['access_token']; 

        console.log("received token " + this.login.access_token)
        this.cookieService.set( 'access_token', this.login.access_token );
        this.cookieValue = this.cookieService.get('access_token');
        console.log("set cookie value" + this.cookieValue);

        // Move this call in subscribe method
        this.farmAccessdata = this.getFarmAccess.farmAccess();
    });

}

组件ngOnInit方法如下：

{{1}}