我应该在 angular 销毁什么？我该怎么办？

Question

我查看了 angular 文档和其他资源，但没有找到任何内容。我在 Angular7 上工作。如何进行销毁处理？

Answer 1

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

@Component({...})
export class MyComponent implements OnDestroy {
    ngOnDestroy(): void {
        // called when the component gets destroyed
    }
}

您可以在此处阅读有关生命周期的更多信息：https://angular.io/guide/lifecycle-hooks

Answer 2

See this scenario


import { Subscription } from 'rxjs';
  currentUserSub: Subscription;


  getCurrentUser() {
    this.currentUserSub = this.authenticationService.currentUser.subscribe(x => {
      if (x) {
        this.currentUser = x[0].MemberId;
      } else { }
    });



 ngOnDestroy() {
    // unsubscribe to ensure no memory leaks
    this.currentUserSub.unsubscribe();
  }


  }

Answer 3

取消订阅组件中所有可观察对象的简洁方法：

//declare 
private ngUnsubscribe: Subject<any> = new Subject<any>();


//add takeUntill where subscribing to observables 
this.myService.serviceFunction()
                .pipe(takeUntil(this.ngUnsubscribe))
                .subscribe(
                    res => {
                        // use res
                    },
                    err => {}
                );


//unsubscribe all
ngOnDestroy() {
        this.ngUnsubscribe.next();
        this.ngUnsubscribe.complete();
    }

我应该在 angular 销毁什么？我该怎么办？

What should I destroy on angular? How should I?

lifecycle

angular