I'm using routerLinkActive in my primary routing.
<a [routerLink]="/user" routerLinkActive="active">Bob</a>
When the URL is /user, the active class will be added to the a tag, but under the primary route, I also have a few secondary routes, so
when the URL is /user/aa, the active will be removed.
I hope that when the URL is either /user/aa or /user/bb, the primary route's class active still exists.
What should I do?