ng new router --routing 
\\ 加routing参数
\\ 会新增一个app-routing.module.ts 文件

const routes:Routes = [
 {path:'',component:HomeComponent}, \\ 注意path里面不要加\线
 {path:'app',component:AdminComponent}
];

{path:'**',component:Code404Component}
// 配置里面加一条代表没有的都往这里，注意这里不能写在前面，不然angualr的路由会优先匹配这里

<a [routerLink]="['/']">主页</a>
<a [routerLink]="['/app']">后台</a>
<router-outlet></router-outlet>

<input type='button' value='跳转到后台' (click)="toApp()">

constructor(private router:Router){
 }
// 点击事件
 toApp(){
 this.router.navigate(['/app'])
 }

/app"['/app']" [queryParams]="{id:1}">后台</a>
// js写法
private appId:number
 constructor(private routerInfo:ActivatedRoute) { }

 ngOnInit() {
 this.appId = this.routerInfo.snapshot.queryParams['id']
 }

{path:/app/:id} => /app/1 => ActivatedRoute.params[id]
// 必须先定义好
<a [routerLink]="['/app',1]">后台</a>

ngOnInit() {
 this.appId = this.routerInfo.snapshot.queryParams['id']
 }

private appId:number

 constructor(private routerInfo:ActivatedRoute) { }

 ngOnInit() {
 this.routerInfo.params.subscribe((params:Params) => {
  this.appId = params['id']
 })
 }

{path:'',redirectTo:'/home',pathMatch:'full'},

{path:'home',component:HomeComponent,children:[
 {path:'',component:IndexComponent}
 ]},
// 记得去HomeComponent，里面添加<router-outlet></router-outlet>指令

// html 视图部分
<router-outlet></router-outlet>
<router-outlet name='aux'></router-outlet>
//路由配置部分
{path:'app',Appcomponet,outlet:'aux'}

// 新建一个文件
import {CanActivate} from '@angular/router'
export class LoginGuard implements CanActivate{
 // 路由会根据这个方法的返回如果返回false就拒绝访问
 canActivate(){
 let isLOgin:boolean = true;
 return isLOgin;
 }
}

// 修改路由配置，添加一个属性canActivate
{path:'home',component:HomeComponent,children:[
 {path:'',component:IndexComponent}
 ],canActivate:[LoginGuard]},
修改NgModule

providers:[LoginGuard]

// 新建一个文件
import {CanDeactivate} from '@angular/router'
import {AppComponent} from "../app.component";

/**
 * 处理用户离开
 * 接收一个泛型
 */
export class OutGuard implements CanDeactivate<AppComponent>{
 // component 里面保存着AppComponent的数据
 canDeactivate(component:AppComponent){
 return window.confirm('您还没有保存确定要离开吗？')
 }
}

{path:'home',component:HomeComponent,children:[
 {path:'',component:IndexComponent}
 ],canActivate:[LoginGuard],canDeactivate:[OutGuard]},

providers:[LoginGuard,OutGuard]