Steve 的答案是当前记录的答案，但是 ActivatedRoute 上的 url observable 没有为我触发，除非我第一次击中基地url(例如:从/index 到/index/item 有效，但从/index/item 到 index/item/2、index/dashboard，甚至/index 都不起作用).

Steve's answer is the one documented currently, but the url observable on ActivatedRoute is not firing for me except when I first hit the base url (ex: going from /index to /index/item works, but going from /index/item to index/item/2, index/dashboard, or even /index does not).

我不确定以下解决方案是否是***实践，也不确定对性能的影响是什么，但我能够在路由器的 NavigationEnd 事件上获得活动路由，如下所示:

I'm not sure if the following solution is a best practice nor what the performance implications are, but I was able to get the active route on the NavigationEnd event of the router with the following:

import { Component, OnInit, OnDestroy } from '@angular/core';
import { ROUTER_DIRECTIVES, Router, NavigationEnd } from '@angular/router';

@Component({
    selector: 'navbar',
    directives: [ROUTER_DIRECTIVES], 
    template: `
                ...
              `    
})

export class NavBarComponent implements OnInit, OnDestroy {
    private sub: any;

    constructor(private router: Router) {
    }

    ngOnInit() {
        this.sub = this.router.events.subscribe(e => {
            if (e instanceof NavigationEnd) {
                console.log(e.url);
            } 
        });
    }


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

每次更改路线时都会触发，无论您在 url 树中有多深或导航到/从哪里.

This fires every time you change the route, regardless of how deep you are in the url tree or where you navigate to/from.