如何从Angular中的Nodejs服务器的HTTP响应中获取数据类型

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

@NgModule({
  imports: [
    HttpClientModule
  ],
  ...
})
export class AppModule { }

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

constructor(private http: HttpClient) { }

this.http.get(url).subscribe(response => {
  // 在这里处理响应数据
});

this.http.get(url).subscribe(response => {
  const contentType = response.headers.get('Content-Type');
  console.log('数据类型：', contentType);
});

this.http.get(url).subscribe(response => {
  const contentType = response.headers.get('Content-Type');
  if (contentType === 'application/json') {
    const jsonData = response.json();
    console.log('JSON数据：', jsonData);
  }
});