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我正在尝试使用 JavaScript 使用Web 服务（ http://www.webservicex.net/CurrencyConvertor.asmx?wsdl ）：

<script type="text/javascript">
   function soap() {

        var xmlhttp = new XMLHttpRequest();
        xmlhttp.open('GET', 'http://www.webservicex.net/CurrencyConvertor.asmx?wsdl',true);
var sr =
       '<?xml version="1.0" encoding="utf-8"?>' +
       '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:web="http://www.webserviceX.NET/">'+
     '<soapenv: Header/>'+
        '<soapenv: Body>'+
        '<web:ConversionRate>'+
     '<web:FromCurrency>EUR</web:FromCurrency>'+
     '<web:ToCurrency>TND</web:ToCurrency>'+
        '</web:ConversionRate>'+
        '</soapenv: Body>'+
        '</soapenv:Envelope>';

        xmlhttp.onreadystatechange = function (e) {
            alert('onready');
            if (xmlhttp.readyState == 4) {
                if (xmlhttp.status == 200) {
                    alert('done use firebug to see response');

                }
            }
            if (xmlhttp.readyState == 0) {
                alert('open() has not been called yet');
            }

            if (xmlhttp.readyState == 1) {
                alert('send() has not been called yet');
            }

            if (xmlhttp.readyState == 2) {
                alert('send() has been called, ...');
            }

            if (xmlhttp.readyState == 3) {
                alert('Interactive - Downloading');
            }
            else
            alert('Consuming Error '+e.message);
        }
        // Send the POST request
        xmlhttp.setRequestHeader("SOAPAction", "http://www.webservicex.net/CurrencyConvertor/");
        xmlhttp.setRequestHeader('Content-Type', 'text/xml');
        xmlhttp.send(sr);
        alert("Hi WS");

        // send request
        // ...
    }

</script>
</head>

<body>
<form>
            <input type="button" value="WS" onclick="soap();">
        </form>
</form>

在执行过程中，我收到了onreadystatechange()函数中提到的不同消息（甚至是错误消息！），但我不知道如何获得 Web 服务返回的答案（我尝试了这一行alert(xmlhttp.responseXML);但徒劳无功），我不知道知道我是否做得对以及如何显示 Web 服务回复。

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