ajax, 提交basic Authorization

var
url="http://192.168.1.154:8080/test/userAction!sysLogin.action";
//var auth = make_basic_auth('111','111');
alert(make_basic_auth('111','111'));
xmlhttp=null;
if (window.XMLHttpRequest)
 {// code for all new browsers
 xmlhttp=new XMLHttpRequest();
 }
else if (window.ActiveXObject)
 {// code for IE5 and IE6
 xmlhttp=new
ActiveXObject("Microsoft.XMLHTTP");
 }
if (xmlhttp!=null)
 {

 xmlhttp.onreadystatechange=state_Change;
 xmlhttp.open("POST",url,true);

 xmlhttp.setRequestHeader("Authorization","Basic
MTExOjExMQ==");
 xmlhttp.setRequestHeader("Content-Type",
"text/plain;charset=UTF-8");
 xmlhttp.send(null);
 }
else
 {
 alert("Your browser does not support
XMLHTTP.");
 }
}

function state_Change()
{
if (xmlhttp.readyState==4)
 {// 4 = "loaded"
 if (xmlhttp.status==200)
   {
// return xmlhttp.status==200;

 alert(xmlhttp.responseText); 
  
   }
 else
   {
  alert("Problem retrieving XML data");
   }
 }