在 Angular 2 中使用嵌套组件

Question

我有一个模块，其中声明了几个组件，当我在模板中使用指令语法时，Angular 找不到组件 - 我收到此错误

'test-cell-map' is not a known element:  

 1. If 'test-cell-map' is an Angular component,
    then verify that it is part of this module.
 2. If 'test-cell-map' is a Web Component then add "CUSTOM_ELEMENTS_SCHEMA"
    to the '@NgModule.schema' of this component to suppress this message.

这里是组件模块

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

import { AppComponent } from './app.component';                                                                                                                                                                                               
import { TestCellMapComponent } from './test-cell-map/test-cell-map.component';                                                                                                                                                               

@NgModule({                                                                                                                                                                                                                                   
    declarations: [                                                                                                                                                                                                                           
        AppComponent,                                                                                                                                                                                                                         
        TestCellMapComponent                                                                                                                                                                                                                  
    ],                                                                                                                                                                                                                                        
    imports: [                                                                                                                                                                                                                                
        BrowserModule,                                                                                                                                                                                                                        
        FormsModule,                                                                                                                                                                                                                          
        HttpModule                                                                                                                                                                                                                            
    ],                                                                                                                                                                                                                                        
    providers: [],                                                                                                                                                                                                                            
    bootstrap: [AppComponent]                                                                                                                                                                                                                 
})                                                                                                                                                                                                                                            
export class AppModule { }

这是顶级组件的样子

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

@Component({                                                                                                                                                                                                                                  
    selector: 'my-app',                                                                                                                                                                                                                       
    templateUrl: './app.component.html',                                                                                                                                                                                                      
    styleUrls: ['./app.component.css']                                                                                                                                                                                                        

})                                                                                                                                                                                                                                            
export class AppComponent {                                                                                                                                                                                                                   
    title = 'app works!';                                                                                                                                                                                                                       
}

及其关联模板

<h1>                                                                                                                                                                                                                                          
   {{title}}                                                                                                                                                                                                                                   
   <test-cell-map></test-cell-map>                                                                                                                                                                                                             
</h1>

Answer 1

TestCellMapComponent selector

有问题

<h1>                                                                                                                                                                                                                                          
  {{title}}                                                                                                                                                                                                                                   
  <app-test-cell-map></app-test-cell-map>      //<<<<===== changed                                                                                                                                                                                                                                                   
</h1>