解决浏览器记住ajax请求并能前进和后退问题

ul{
 margin:0;
 padding:0;
}
li{
 list-style: none;
 display: block;
 float: left;
 border: 1px solid #000;
 padding: 10px;
 margin-right: 20px;
 cursor: pointer;
}
li.active{
 background-color: #000000;
 color: #fff;
}
<ul>
 <li data-id="1">1</li>
 <li data-id="2">2</li>
</ul>

function sendAjax(hash){
 console.log("recived data:" + hash);
}
function btnStatus(hash){
 $("li").removeClass('active');
 $("li[data-id="+hash+"]").addClass('active');
}
function onHashChange(){
 var curHash = window.location.hash.replace("#","");
 if(curHash){
  btnStatus(curHash);
  sendAjax(curHash);
 }
}
window.onhashchange = onHashChange;
$("li").click(function(){
 var id = $(this).attr('data-id');
 window.location.hash = id;
});

recived data:1
recived data:2
recived data:2

recived data:1
recived data:2
recived data:1