working with query param in angular 2

angular2.queryParams.ts

//pass a query param
 onNavigate(){
        this.router.navigate(['/'],{queryParams:{"analytics":100}});
    }
    
//get a query param in that component, here it is / so it refers to main or home compnent 
import { Component, OnInit,OnDestroy } from '@angular/core';
import {Router} from '@angular/router';
import {Subscription} from 'rxjs/Rx';

@compoenent({
})

export class HomeComponent implements OnInit, OnDestroy {
    parma:string;
    subscription :Subscription;
    constructor(private router: Router) {
        this.subscription = router.routerState.root.queryParams.subscribe(
            (queryParam:any) =>this.parma = queryParam['analytics']
        );
     }

    ngOnInit() { }
    ngOnDestroy() {
        this.subscription.unsubscribe();
        //Called once, before the instance is destroyed.
        //Add 'implements OnDestroy' to the class.
        
    }
}