Angular 7 错误 RangeError : Maximum call stack size exceeded

Question

我正在尝试通过遵循 official tutorial 来学习 Angular但是当执行 hero component 的步骤时和 hero detail component ，它会引发错误“RangeError:超出最大调用堆栈大小”。

hero.component.html :

<ul class="heroes">
  <li *ngFor="let hero of heroes" (click)="onSelect(hero)" [class.selected]="hero === selectedHero">
    <span class="badge">{{hero.id}}</span> {{hero.name}}
  </li>
</ul>

<!-- 
<app-hero-detail [hero]="selectedHero"></app-hero-detail> -->


<app-heroes></app-heroes>

detail component :

<div *ngIf="hero">

  <h2>{{hero.name}} Details</h2>
  <div><span>id: </span>{{hero.id}}</div>
  <div>
    <label>name:
      <input [(ngModel)]="hero.name" placeholder="name"/>
    </label>
  </div>

</div>

<app-hero-detail [hero]="selectedHero"></app-hero-detail>

hero component

import { Component, OnInit } from '@angular/core';
import { Hero } from '../hero';
import { HEROES } from '../mock-heroes';
import { HeroService } from '../hero.service';

@Component({
  selector: 'app-heroes',
  templateUrl: './heroes.component.html',
  styleUrls: ['./heroes.component.css']
})
export class HeroesComponent implements OnInit {
  heroes: Hero[];

  selectedHero: Hero;

  constructor(private heroService: HeroService) { }

  ngOnInit() {
    this.getHeroes();
  }

  getHeroes(): void {
    this.heroes = this.heroService.getHeroes();
  }

  onSelect(hero: Hero): void {
    this.selectedHero = hero;
  }

}

hero.detail component

import { Component, OnInit, Input } from '@angular/core';
import { Hero } from '../hero';

@Component({
  selector: 'app-hero-detail',
  templateUrl: './hero-detail.component.html',
  styleUrls: ['./hero-detail.component.css']
})
export class HeroDetailComponent implements OnInit {

  @Input() hero: Hero;
  constructor() { }

  ngOnInit() {
  }

}

有一件事值得一提，当<app-heroes></app-heroes>有注释，列表页加载无误

感谢任何帮助

Answer 1

1.出现死循环时出现该错误。正如您提到的，当 app-heroes 被评论时页面加载，这可能被用作多个组件的选择器名称，这是不允许的。这可能会导致无限循环并无法加载组件。

1. 尝试进行以下修改，

hero.component.html

<ul class="heroes">
  <li *ngFor="let hero of heroes" (click)="onSelect(hero)" [class.selected]="hero === selectedHero">
    <span class="badge">{{hero.id}}</span> {{hero.name}}
  </li>
</ul>

<app-hero-detail [hero]="selectedhero"></app-hero-detail> 

hero.detail.component.html

<div *ngIf="hero">
  <h2>{{hero.name}} Details</h2>
  <div><span>id: </span>{{hero.id}}</div>
  <div>
    <label>name:
      <input [(ngModel)]="hero.name" placeholder="name"/>
    </label>
  </div>
</div>

希望这对您有所帮助。