how to get browser beforeload route in angular 6 code example

Example 1: angular navigate using component

import {Router} from '@angular/router'; // import router from angular router

export class Component{ 				// Example component.. 
	constructor(private route:Router){} 
  
  	go(){
		this.route.navigate(['/page']); // navigate to other page
	}
}

Example 2: angular on back skip routes

this.router.navigate(["/c"], { replaceUrl: true });