options = [];
addOption(newOption: string) {
  this.options.push(newOption);
}
完整示例: component.ts
import { Component } from '@angular/core';
@Component({
  selector: 'app-component',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  options = ['Option 1', 'Option 2', 'Option 3'];
  selectedOption = '';
  addOption(newOption: string) {
    this.options.push(newOption);
  }
}
component.html