Angular之替换根组件

一在index.html中，替换根组件选择器

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Angular4ReactiveForm</title>
  <base href="/">

  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">
</head>
<body>
  <app-hero-list></app-hero-list>
</body>
</html>

二在根模块的注解中，替换根组件

import { BrowserModule } from '@angular/platform-browser';
import { ReactiveFormsModule } from '@angular/forms';
import { NgModule } from '@angular/core';


import { HeroListComponent } from './hero-list/hero-list.component';
import { HeroDetailComponent } from './hero-detail/hero-detail.component';


@NgModule({
  declarations: [
    HeroListComponent,
    HeroDetailComponent
  ],
  imports: [
    BrowserModule,
    ReactiveFormsModule
  ],
  providers: [],
  bootstrap: [HeroListComponent]
})
export class AppModule { }

三如果浏览器控制台没有报错 ( The selector "app-hero-list" did not match any elements )，并编译、运行，则替换成功。