jquery method to determine when the browser goes back and a message pops up_jquery

There must be some messages when the browser goes back. Here we use jquery to determine when the browser goes back and pop up a message

jQuery(document).ready(function ($) {
if (window.history && window.history.pushState) {
$(window).on('popstate', function () {
var hashLocation = location.hash;
var hashSplit = hashLocation.split("#!/");
var hashName = hashSplit[1];
if (hashName !== '') {
var hash = window.location.hash;
if (hash === '') {
alert("Back button isn't supported. You are leaving this application on next clicking the back button");
}
}
});
window.history.pushState('forward', null, './#forward');
}
});