JS调用WebService

<html>
<title>接口测试</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<body>
    <script language="javascript">
function RequestByPost()
{
var KUNNR = document.getElementById(\'KUNNR\').value;
var NAME1 = document.getElementById(\'KUNNR\').value;
var TELF1 = document.getElementById(\'KUNNR\').value;
var CALLNAME = document.getElementById(\'KUNNR\').value;
var data;

data = \'<?xml version="1.0" encoding="utf-8"?>\';
data = data + \'<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">\';
data = data + \'<soap:Body>\';
data = data + \'<CallInfo xmlns="http://10.100.110.33/Service">\';
data = data + \'<KUNNR>\'+KUNNR+\'</KUNNR>\';
data = data + \'<NAME1>\'+NAME1+\'</NAME1>\';
data = data + \'<TELF1>\'+TELF1+\'</TELF1>\';
data = data + \'<CALLNAME>\'+CALLNAME+\'</CALLNAME>\';
data = data + \'</CallInfo>\';
data = data + \'</soap:Body>\';
data = data + \'</soap:Envelope>\';

//var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
var URL="http://10.100.110.33:8188/service.asmx";
xmlhttp.Open("POST",URL, false);
xmlhttp.SetRequestHeader ("Content-Type","text/xml; charset=gb2312");
xmlhttp.SetRequestHeader ("SOAPAction","http://10.100.110.33/Service/CallInfo");
xmlhttp.Send(data);
document.write( xmlhttp.responseText);
alert(data);
}


// --></script>
    <input id="KUNNR" type="text" value=""></br>
<input id="NAME1" type="text" value=""></br>
<input id="TELF1" type="text" value=""></br>
<input id="CALLNAME" type="text" value=""></br>
    <input type="button" value="send" onclick="RequestByPost()">
</body>
</html>