上篇文章里首先学习了路由对象的基本配置包括Routes, RouterOutlet，RouterLink

这3个路由配置对象，这次来学习一下Router的用法吧。

步一：app.component.html文件

                        

                        

            步二：app.component.ts文件   

                        export class AppComponent {

                        constructor ( private router : Router) {   }        //1.

                        tabProductDetails () {                                      //2.

                        this.router.navigate(['/product'])

                        }

                        }

这回需要解决一个第二个问题：报错信息如图显示。

            在说的是找不到路由配置

            解决过程：说明：需要用通配符来解决问题

                           步一： 新增组件: ng g component code404

                           步二：在code404.component.html中写入

                            步三: app-routing.module.ts，先引入

                                     import {Code404Component} from './code404/code404.component';

                                      再配置路由

                                     const routes: Routes = [

                                    {path :' ** ', component : Code404Component }

                                    ]