as the title: novice to angular, I really don"t understand the official method of obtaining routing parameters. The code is as follows

//  /-sharp/store/assets-list/case  
/*
    :
    store
    assets-list
    caseid
    :assets-listngOnInit
*/

questions are as follows

// assets-list
import { Router, ActivatedRoute, ParamMap } from "@angular/router";
constructor(
    private router: Router,
    private routerParams: ActivatedRoute
  ) { }
ngOnInit() {
    this.routerParams.snapshot.paramMap.get("id")  // id
}
/*
* caseid,
* 
* vue watch router
*/

some people seem to use Observable objects after reading the official documents, but copy the official demo code and get no results at all (no errors reported)
online, etc.