Angular 2: http.get对字符串的响应

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

@Component({
  selector: 'app-example',
  template: `
    <button (click)="getData()">Get Data</button>
    <div>{{ responseData }}</div>
  `
})
export class ExampleComponent implements OnInit {
  responseData: string;

  constructor(private http: HttpClient) { }

  ngOnInit() {
  }

  getData() {
    this.http.get<string>('https://api.example.com/data').subscribe(
      response => {
        this.responseData = response;
      },
      error => {
        console.error(error);
      }
    );
  }
}