Detailed explanation of router usage in Angular4

import { Component } from '@angular/core';
import { Gundam } from '../../model/gundam';
@Component({
  template: `
    <p *ngIf="selectedGundam">
    <span>{{selectedGundam.name}}</span>
    <span>{{selectedGundam.type}}</span>
    </p>
  `
})
export class GundamDetailComponent {
    selectedGundam: Gundam;
}

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

 imports: [
  BrowserModule,
  FormsModule,
  RouterModule.forRoot()
 ],

RouterModule.forRoot([
  {
    path: '',
    component: AppComponent
  },
  {
    path: '',
    component: GundamDetailComponent
  }
])

import {
NgModule
} from '@angular/core';
import {
BrowserModule
} from '@angular/platform-browser';
import {
FormsModule
} from '@angular/forms';
import { RouterModule }  from '@angular/router';
import {
AppComponent
} from './component/appcomponent/app.component';
import { GundamDetailComponent } from './component/detail/gundam-detail.component';
@NgModule({
  imports: [
    BrowserModule,
    FormsModule,
    RouterModule.forRoot([
      {
        path: '',
        component: AppComponent
      },
      {
        path: '',
        component: GundamDetailComponent
      }
      ])
  ],
  declarations: [
    AppComponent,
    GundamDetailComponent
  ],
  bootstrap: [AppComponent],
})
export class AppModule {}

<router-outlet></router-outlet>

import {
Component
} from '@angular/core';
import { Gundam } from '../../model/gundam';
import { GUNDAMS } from './../../service/data';
@Component({
  template: `
    <p *ngFor="let gundam of gundams" (click)="onSelected(gundam)">
      <span>
        {{gundam.name}}
      </span>
    </p>
  `
})
export class GundamHostComponent {
  gundam: Gundam = {
    name: '海牛',
    type: 'NewType'
  };
  gundams = GUNDAMS;
  selectedGundam: Gundam; // 定义一个selectedGudam作为展示详情的变量
  onSelected (gundam: Gundam): void {
    this.selectedGundam = gundam; // 通过参数赋值
  }
}

{
  path: 'detail',
  component: GundamDetailComponent
}

parseGundamToString(gundam: Gundam): string {
  return gundam.name + '&' + gundam.type;
} // 将gundam类转化为固定格式的字符串

<p *ngFor="let gundam of gundams" routerLink="/detail/name=parseGundamToString(gundam)">
  <span>
  {{gundam.name}}
  </span>
</p>

{
  path: 'detail/:gundam',
  component: GundamDetailComponent
}

import { Component, OnInit } from '@angular/core';

export class GundamDetailComponent implements OnInit {
  selectedGundam: Gundam ;
  ngOnInit(): void {
  }
}

import { ActivatedRoute, Params }  from '@angular/router';

constructor(
private route: ActivatedRoute){}

this.route.params.switchMap((params: Params) => console.log(params))

import 'rxjs/add/operator/switchMap';

(params: Params) => this.gundamStr = params['gundam']

function(params){
  this.gundamStr = params['gundam']
}

parseStringToGundam(str: string): Gundam {
  const temp = str.split('&');
  const tempGundam: Gundam = {
  name: temp[0],
  type: temp[1]
  };
  return tempGundam;
}

ngOnInit(): void {
  this.route.params // 通过注入的方式拿到route里的参数params
  .switchMap((params: Params) => this.gundamStr = params['gundam']) // 通过参数拿到gundam字符串并付给detail里的一个临时变量
  .subscribe(() => this.selectedGundam = this.parseStringToGundam(this.gundamStr)); // 通过反格式化函数解析临时变量并返回给作为显示的model
}

import {
NgModule
} from '@angular/core';
import { RouterModule }  from '@angular/router';
import { GundamDetailComponent } from './component/detail/gundam-detail.component';
import { GundamHostComponent } from './component/host/gundam-host.component';
@NgModule({
  imports: [
    RouterModule.forRoot([
      {
        path: '',
        component: GundamHostComponent
      },
      {
        path: 'detail/:id',
        component: GundamDetailComponent
      }
    ])
  ],
  exports: [RouterModule]
})
export class AppRoutingModule {
}

import {
NgModule
} from '@angular/core';
import {
BrowserModule
} from '@angular/platform-browser';
import {
FormsModule
} from '@angular/forms';
import {
AppComponent
} from './component/appcomponent/app.component';
import { GundamDetailComponent } from './component/detail/gundam-detail.component';
import { GundamHostComponent } from './component/host/gundam-host.component';
import { AppRoutingModule } from './app-routing.module';
@NgModule({
  imports: [
    BrowserModule,
    FormsModule,
    AppRoutingModule // 调用路由
  ],
  declarations: [
    AppComponent,
    GundamDetailComponent,
    GundamHostComponent
  ],
  bootstrap: [AppComponent],
})
export class AppModule {}

import {
NgModule
} from '@angular/core';
import { RouterModule, Route }  from '@angular/router';
import { GundamDetailComponent } from './component/detail/gundam-detail.component';
import { GundamHostComponent } from './component/host/gundam-host.component';
const routes: Route[] = [
  {
    path: '',
    component: GundamHostComponent
  },
  {
    path: 'detail/:gundam',
    component: GundamDetailComponent
  }
];
@NgModule({
  imports: [
    RouterModule.forRoot(routes)
  ],
  exports: [RouterModule]
})
export class AppRoutingModule {
}