使用Angular RouterModule的Ionic v4。因此，您可以获得如下代码所示的路由总数
此._router.配置长度

import { Router } from '@angular/router';
export class ActionSheetComponent {
  totalRouteCount: number = 0;
  constructor(
    private actionSheetCtrl: ActionSheetController,
    private _router: Router
  ) {
    console.log(this._router.config.length);
    this.totalRouteCount = this._router.config.length;
  }
}

working example