如何在不使用angular中的ng类的情况下动态地将ng-click上的ng-style应用于所选项目

<button (click)="changeStyle = !changeStyle">点击按钮</button>

.selected {
  background-color: red;
}

.not-selected {
  background-color: blue;
}

export class YourComponent {
  changeStyle: boolean = false;

  getSelectedStyle() {
    return this.changeStyle ? 'selected' : 'not-selected';
  }
}

<div [ngClass]="getSelectedStyle()" (click)="changeStyle = !changeStyle">所选项目</div>