Angular 4中的$locationChangeStart等价物

你想要的是NavigationStart事件.

Angular Docs NavigationStart

这是一个很好的代码示例,作为this StackOverflow question关于如何正确使用它的答案提供.

import { Router,ActivatedRoute,NavigationStart } from '@angular/router'; 

export class AppComponent { 
   constructor(public _router: Router,private _activeRoute: ActivatedRoute,private _LOCATIOn: LOCATIOn) {
     this.router = _router; 
     this.router.events
         .filter(e => e instanceof   NavigationStart)     
         .pairwise()
         .subscribe((E) => { alert(E); }); 
   }
}