*ngIf根据数据库值显示项目

<element *ngIf="condition">...</element>

import { Component } from '@angular/core';
import { DataService } from 'path/to/data.service';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css']
})
export class ExampleComponent {
  showProject: boolean;

  constructor(private dataService: DataService) {
    // 从数据服务中获取数据库的值
    this.showProject = this.dataService.getShowProjectValue();
  }
}

<div *ngIf="showProject">
  <!-- 显示的项目内容 -->
</div>