problem description

the angular4
project used by my local framework uses the sweetAlert2 pop-up component
and defines the data
code as follows

export class HeaderComponent implements OnInit {
  public secondNavState:number;
  public busyStateNum:number = 1;
  private dropDownCtrl = 0;
  constructor() { }
}

the following is the method to call sweetAlert

swal({
    type:"warning",
    title:"",
}).then(function(that){
   event.target.parentElement.classList.add("active");
   //angular busyStateNum  thisundefinder
})

Thank you in advance. If you don"t understand, I can continue to add