app HTML

<div class="wrapper"><h2>我是父组件</h2><div>这个div定义在父组件中</div><app-child><div class="header">这个div是父组件投影到子组件的1, {{title}}</div><div class="footer">这个div是父组件投影到子组件的2</div></app-child>
</div>
<div [innerHTML] = "divContent"></div>

app TS

import { Component } from '@angular/core';@Component({selector: 'app-root',templateUrl: './app.component.html',styleUrls: ['./app.component.css']
})
export class AppComponent {title = 'demo';divContent = '<div>天下打工</div>';
}

child HTML

<div class="wrapper"><h2>我是子组件</h2><div>这个div定义在子组件中</div><div>内容投影使用 ng-content 跟 select</div><ng-content select=".footer"></ng-content><ng-content select=".header"></ng-content>
</div>