由于Angular的HttpClient返回的是Observable对象，当不再需要这个流时，应该手动取消订阅，否则会导致内存泄漏问题。以下是一个使用HttpClient的示例代码：

import { Component, OnDestroy } from '@angular/core'; import { HttpClient } from '@angular/common/http'; import { Observable, Subscription } from 'rxjs';

@Component({ selector: 'app-example', templateUrl: './example.component.html', }) export class ExampleComponent implements OnDestroy { private subscription: Subscription;

constructor(private http: HttpClient) { this.subscription = this.http.get('/api/data').subscribe(response => { console.log(response); }); }

ngOnDestroy(): void { if (this.subscription) { this.subscription.unsubscribe(); } } }

在组件销毁时，手动取消订阅防止内存泄漏。