Get latest id on button click in sharepoint using spservices

<script src="***/jquery-2.1.3.min%20(1).js" type="text/javascript"></script>
<script src="***/jquery.SPServices-2014.02.min.js" type="text/javascript"></script>
<script language="javascript" type="text/javascript">

$(document).ready(function(){
alert("working");


$("#btnredirect").click(function(){
alert("btnredirect");
var lastid=$().SPServices.SPGetLastItemId({ 
 listName: "Work Orders"
});

var currentid= parseInt(lastid)+1;
alert(currentid);
window.loction="https://pslightwave.sharepoint.com/sites/Operations/WorkOrders/Lists/Work%20Orders/NewForm.aspx?Source=/sites/Operations/WorkOrders/Lists/Work%20Orders/DispForm.aspx?id="+currentid;
});

});
</script>


<button id="btnredirect">Create new work order </button>