订阅角2中的功能

Question

我想在同一订阅方法或ngOninit方法（注释一）中看到从服务返回的结果，但它没有显示结果，即使它正在从服务中获取结果..

ngOnInit() { 
    this.cityAreaService.getCities().subscribe(data => { 
     this.cities = data; 
     //console.log(this.cities); 
    }); 
    //console.log(this.cities) 
} 

服务

getCities() { 
    return this.http.get(globalVar.serviceUrl + 'Cities').map((res: Response) => res.json()); 
} 

Answer 1

你可以尝试读取的其他块响应订阅

this.cityAreaService.getCities().subscribe(
    response => { 
    this.cities = response; 
    }, 
    error => { 
    // maybe error 
    }, 
() => { 
    // anything else? 
    } 
);