在angular的下拉列表中使用if条件

<select>
  <option *ngFor="let item of items" [value]="item">{{ item }}</option>
</select>

<button (click)="toggleCondition()">Toggle Condition</button>

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

@Component({
  selector: 'app-dropdown',
  templateUrl: './dropdown.component.html',
  styleUrls: ['./dropdown.component.css']
})
export class DropdownComponent {
  items: string[] = ['Option 1', 'Option 2', 'Option 3'];
  showOptions: boolean = true;

  toggleCondition() {
    this.showOptions = !this.showOptions;
  }
}

select {
  width: 200px;
  height: 30px;
}