Angular 。输入和输出。要解决这个问题，只需将“+”替换为“~”。这就是路由器插座~*。工作得非常好。谢谢你能提供一个更完整的例子吗？。。。并解释此代码如何回答问题。这不再适用于ivy，因为新节点是在现有节点之后添加的，而在之前添加之前 <app>

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。输入和输出。要解决这个问题，只需将“+”替换为“~”。这就是

路由器插座~*

。工作得非常好。谢谢你能提供一个更完整的例子吗？。。。并解释此代码如何回答问题。这不再适用于ivy，因为新节点是在现有节点之后添加的，而在之前添加之前

<app>
    <router-outlet></router-outlet>
    <project>...</project>
</app>

@Component({
  selector:'project',
  host: {
      class:'classYouWantApplied'
  }
})

<app>
    <router-outlet></router-outlet>
    <project class="classYouWantApplied">...</project>
</app>

router-outlet + project { ... }

    :host /deep/ router-outlet + project {
        display: block;
        border: 10px solid black;
    }

constructor(private renderer: Renderer2, private elemRef: ElementRef) {
  if(someCondition){
    renderer.addClass(elemRef.nativeElement, 'myClass');
  }
}

import { Component, HostBinding, Host (optional for typing) } from '@angular/core';

@Component({...})
export class GiveMeAClassComponent {
    @HostBinding('class.some-class') someClass: Host = true;
    ...
}

.some-class {
    // Styles in here will now be applied to your GiveMeAClassComponent at a root level
}

<app>
  <div class="your css class">
   <router-outlet></router-outlet>
</div>
</app>

router-outlet + * {
  /* your css */
}

export class ProjectComponent {
  @HostBinding('class') classes = 'classYouWantApplied';
}

<router-outlet routerOutletHelper
               [routerOutletHelperClass]="'blue-border'"></router-outlet>

import { Directive, ElementRef, Renderer2, Input } from "@angular/core";
import { RouterOutlet } from "@angular/router";
import { Subscription } from "rxjs";

@Directive({
    selector: 'router-outlet[routerOutletHelper]'
})
export class RouterOutletHelperDirective
{
    constructor(private routerOutlet: RouterOutlet,
                private element: ElementRef<HTMLElement>,
                private renderer: Renderer2) { }

    subscription = new Subscription();

    @Input('routerOutletHelperClass')
    customClassName: string | undefined;

    ngOnInit() 
    {
        this.subscription.add(this.routerOutlet.activateEvents.subscribe((_evt: any) => {

            // find the component element that was just added
            const componentElement = this.element.nativeElement.nextSibling;

            // add a custom class
            if (this.customClassName) 
            {
                this.renderer.addClass(componentElement, this.customClassName);
            }

            // add my default classes, unless the activated route data 
            // (specified in module routing file) has { addDefaultClasses: false }
            if (this.routerOutlet.activatedRouteData && this.routerOutlet.activatedRouteData.addDefaultClasses !== false)
            {
                // these are my application's default classes (material / theming)
                // (an additional data parameter could be 'darkTheme: boolean')
                this.renderer.addClass(componentElement, 'mat-typography');
                this.renderer.addClass(componentElement, 'rr-theme-light');
            }
        }));
    }

    ngOnDestroy()
    {    
        this.subscription.unsubscribe();
    }
}

<div class="classYouWantApplied">
  <router-outlet>
</div>

@Component({
  selector:'project',
  host: {
      class:'Project-wrapper'
  }
})

::ng-deep to target it:
::ng-deep .Project-wrapper {}