angular路由高亮之实现步骤详解

// 用法概览
@Directive({
  selector: '[routerLinkActive]',
  exportAs: 'routerLinkActive'
})
class RouterLinkActive implements OnChanges, OnDestroy, AfterContentInit {
 constructor(router: Router, element: ElementRef, renderer: Renderer2, cdr: ChangeDetectorRef)
 links: QueryList<RouterLink>
 linksWithHrefs: QueryList<RouterLinkWithHref>
 get isActive: boolean
 routerLinkActiveOptions: {...}
 set routerLinkActive: string[] | string
 ngAfterContentInit(): void
 ngOnChanges(changes: SimpleChanges): void
 ngOnDestroy(): void
}

.red{
  color: red;
}

<a routerLink="/user/login" routerLinkActive="red">login</a>

<a routerLink="/user/login" routerLinkActive="class1 class2">login</a>

<a routerLink="/user/login" routerLinkActive="class1 class2">login</a>
login

<a routerLink="/user/login" routerLinkActive #rla="routerLinkActive">
 login {{ rla.isActive ? '激活' : '未激活'}}
</a>

<p routerLinkActive="red" [routerLinkActiveOptions]="{exact: true}">
 <a routerLink="/user/login">login</a>
 <a routerLink="/user/reset">reset</a>
</p>