角2子布线不工作

我正在尝试在应用程序中实现子路由器。 我所做的是,单击侧菜单,我将以

this._router.navigate(['/parent/child']);

但它没有执行子组件,而是再次执行父组件。

app.module.ts中的路由器

const appRoutes: Routes = [
   { path: 'login', component: LoginComponent },
   {path:'parent',
       children:[
           {path: '', component: ParentComponent, pathMatch: 'full'}
          ,{path:"child",component:ChildComponent,
             outlet:'content'
           }]
   },
   {path:'**',component:LoginComponent}
 ];

父组件

 import { Component } from '@angular/core';
 import {Router} from '@angular/router';
 import {OnInit} from '@angular/core';

 @Component({
   selector: 'login',
   templateUrl: 'app/parent.template.html'
 })
 export class ParentComponent  implements OnInit{  
  constructor(private _router: Router){} 
   ngOnInit(){}
   menuClicked(event:any):void{             
        let elements = event.target.parentElement.children;
        for(let i=0;i<elements.length;i++){
            elements[i].classList.remove('active')
        }
        event.target.classList.add('active');
        this._router.navigate(['/parent/child']);
    }
 }

子组件:

 import { Component } from '@angular/core';
 import {Router} from '@angular/router';
 import {OnInit} from '@angular/core';

 @Component({
    templateUrl: 'app/child.template.html',
 })
 export class IncidentComponent  implements OnInit{  
    constructor(private _router: Router){} 
    ngOnInit(){}
}

发生的是,它导航到父级,工作正常。当我单击左菜单时,我可以看到URL在几秒钟内发生变化,然后重新加载父级,从URL中删除子级名称。我怎么修?我在实现中遗漏了什么?

父模板

<div class="home-container row">
   <div class="home-body col-12">
       <div class="home-header row">

       </div>
       <div class="home-contents row">
          <div class="left-menu col-2">
          </div>
       <div class="right-contents col-10">
          <router-outlet name="content"></router-outlet>
       </div>
   </div>
 </div>