1window.history.pushState({page: 1}, "", "");
2
3window.onpopstate = function(event) {
4
5  // "event" object seems to contain value only when the back button is clicked
6  // and if the pop state event fires due to clicks on a button
7  // or a link it comes up as "undefined" 
8
9  if(event){
10    // Code to handle back button or prevent from navigation
11  }
12  else{
13    // Continue user action through link or button
14  }
15}
16

1function goBack() {
2    window.location.hash = window.location.lasthash[window.location.lasthash.length-1];
3 	window.location.lasthash.pop();
4}