var foo = document.createElement("a");
//foo.href = "http://www.example.com:8080/demo/";
foo.href = document.location.href;
foo.port = 8000;
document.location.href = foo.location.href ;
//var newURL = foo.href;
//console.log(newURL); // output: http://www.example.com:8000/demo/
