angular2 路由问题

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import {loginComponent} from './login/login.component';
import{indexComponent} from "./index/index.component";
import {mainComponent} from "./main/main.component";
const routes: Routes = [
 {path:'login',component:loginComponent},
 {path:'index',component:indexComponent,children:[
   {path:"main",component:mainComponent},
   {path:'',redirectTo:'/main',pathMatch:'full'}
   ]},
 {path:'',redirectTo:'/index',pathMatch:'full'}
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule],
})
export class MyRoutingModule { }