onclick add and remove class in angular 6 code example

Example 1: add a route to a buttoin in angular

<button type="button" class="btn btn-primary-outline pull-right" (click)="btnClick();"><i class="fa fa-plus"></i> Add</button>    

// myComponent.component.ts file 
import { Router } from '@angular/router';

constructor(private router: Router) {

}
// myComponent.component.thml
btnClick= function () {
        this.router.navigateByUrl('/user');
};

Example 2: how to create app.routing.module.ts in angular 6

ng generate module app-routing --flat --module=app