How to listen state change in Angular 2 router?

In Angular 1.x I used this event:

$rootScope.$on('$stateChangeStart',

    function(event,toState,toParams,fromState,fromParams, options){ ... })

So, if I use this eventlistener in Angular 2:

window.addEventListener(hashchange, () => {return console.log('ok')}, false);

it isn't return 'ok', then change state from JS, only then browser history.back() function run.

Use router.subscribe() function as the service:

import {Injectable} from 'angular2/core';

import {Router} from 'angular2/router';



@Injectable()

export class SubscribeService {

    constructor (private _router: Router) {

        this._router.subscribe(val => {

            console.info(val, '<-- subscribe func');

        })

    }

}

Inject service in component which init in routing:

import {Component} from 'angular2/core';

import {Router} from 'angular2/router';



@Component({

    selector: 'main',

    templateUrl: '../templates/main.html',

    providers: [SubscribeService]

})

export class MainComponent {

    constructor (private subscribeService: SubscribeService) {}

}

I inject this service in other components such as in this example. Then I change state, console.info() in service not working.

What I do wrong?