Angular 5 HTTP get response error属性'body'在'Object'类型上不存在

Question

我正在使用Http。

开发Angular 5

在为应用程序提供服务时出现此错误..

import { Component, OnInit } from '@angular/core';
import { Router, ActivatedRoute, ParamMap } from '@angular/router';
import { HttpClient } from '@angular/common/http';
import 'rxjs/add/operator/switchMap';

@Component({
 selector: 'app-post-detail',
 templateUrl: './post-detail.component.html',
 styleUrls: ['./post-detail.component.css']
})
export class PostDetailComponent implements OnInit {
 body: string;
 recent: {};
 constructor(
    private route: ActivatedRoute,
    private router: Router,
    private http: HttpClient,
 ) { }

 ngOnInit() {
   let id = this.route.snapshot.paramMap.get('id');
   let userId = this.route.snapshot.paramMap.get('userid');
   this.getUserPosts(userId);
   this.http.get('https://jsonplaceholder.typicode.com/posts/'+id)
   .subscribe((data)=>{
    this.body = data.body;
   });
 }
}

我不知道为什么我收到此错误，并根据语法将类型指定为类中的字符串。

API的响应如下，

Answer 1

(data)=>{
    this.body = data.body;
}

data不是json。您需要在.json()上运行data。或者您可以在订阅之前运行map：

 this.http.get('https://jsonplaceholder.typicode.com/posts/'+id)
   .map(res => res.json())
   .subscribe((data)=>{
      this.body = data.body;
 });

要使用map，您需要导入它：

import 'rxjs/add/operator/map'

点击此处查看更多示例：https://angular.io/api/http/Http

修改：

输入响应 - 您需要为响应创建一个接口：

interface SomeResponse {
  Body: SomeType;
}

并提出这样的请求：

this.http.get<SomeResponse>'https://jsonplaceholder.typicode.com/posts/'+id)
  .subscribe((data)=>{
    this.body = data.body;
  });

此处有更多示例：https://codingthesmartway.com/angular-4-3-httpclient-accessing-rest-web-services-with-angular/