it is not recommended to put such complex logic in the template, generally complex logic is placed in the method, and then the method is called with events.

   //
   <span (click)="openlink"></span>

  //ts 
  //
  openlink(): void {
    const os = 'android/ios';
     if (os === 'android'){
         //
         location.href = 'andriod  ';
     }else if (os === 'ios')(
       location.href = 'ios  ';
     )else{
      location.href = '  ';
     }
  }
   
   

if event listeners are placed on the a tag, block the default behavior.

if the answer is helpful to you, I hope to adopt