How to disable the default behaviour of back button

Smart TV
1

i am trying to disable the the default behaviour back button using javascript but it is not working

window.addEventListener(‘tizenhwkey’, function (e) {

    if (e.keyName == "back") {
         e.preventdefault() ;       
      }

}

2

Try with

if (e.keyCode === 10009) {
      e.preventDefault();
}
3

Not working ,not able to prevent the default back behaviour