角6: http获取响应

Question

我对角质还不熟悉。我试图获得一个简单的http请求并获得这个JSON：https://jsonplaceholder.typicode.com/users，具体来说，我只想循环名称。

在app.module.ts中，我添加了HttpClientModule：

import { HttpClientModule } from '@angular/common/http';

在workers.component.ts中，这就是我所拥有的：

import { Component, OnInit } from '@angular/core';

import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-workers',
  templateUrl: './workers.component.html',
  styleUrls: ['./workers.component.css']
})
export class WorkersComponent implements OnInit {
  showList = [];
  http: HttpClient;

  constructor() { }

  ngOnInit() {
    //THIS IS WHAT I TRIED
    let obs = this.http.get('https://jsonplaceholder.typicode.com/users');
    obs.subscribe(() => console.log('Got the response, yay.'));

    //Later I would try to get the name with response[0].name

  }

}

workers.component.html非常简单：

          <table class="table">
          <thead>
              <tr>
                <th scope="col">Name</th>
              </tr>
            </thead>
            <tbody>
              <tr> 
                <td *nfFor="let name of names">{{name}}</td>    
              </tr>
            </tbody>         
      </table>

目前，我只得到一个错误：

ERROR TypeError:无法读取未定义的属性get( WorkersComponent.push../src/app/workers/workers.component.ts.WorkersComponent.ngOnInit (workers.component.ts:29) )

Answer 1

您需要在构造函数内注入http，不要声明为变量类型，

constructor(private http: HttpClient) { }

DEMO

Answer 2

导入HttpClientModule

app.module.ts

   imports: [
        HttpClientModule
    ]

workers.component.ts

constructor(private http: HttpClient) { }