如何在注销angular 4后禁用按钮？

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

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

  ngOnDestroy() {
    this.isDisabled = true;
  }
}