مشکل این کد کجاس؟؟؟؟؟؟؟؟

[امیر وی بی]

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>

<script>

$(document).on('ready',function(){

var username ="";

var password ="";

function make_base_auth(username, password) {

var tok = username + ':' + password;

var hash = btoa(tok);

return "Basic " + hash ;

}

$.ajax({

url: "http://api.kavenegar.com/v1/0/utils/getdate.json",

dataType: "json",

type: "GET",

success: function(data){

alert("success");

},

beforeSend: function(xhr){

alert(make_base_auth(username, password));

xhr.setRequestHeader('Authorization:',make_base_au th(username, password));

},

complete: function(){

alert("complete");

},

error: function(result){

alert("err:"+result);

}



});









});











</script>