步骤如下：

下载微软HTC组件：http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/samples/internet/behaviors/library/webservice/default.asp

Web服务WSDL:

<?xml version="1.0" encoding="UTF-8"?>
<definitions name="WS_SYSTEM_LOGIN_SELECT" targetNamespace="SCRM4U_SERVICE" xmlns:tns="SCRM4U_SERVICE" xmlns:wsdlns="SCRM4U_SERVICE" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:tns1="SCRM4U_SERVICE">
    <document>
        <URL>http://192.168.2.148:8080/SCRM4U_SERVICE/servlet/HLP_PWS_SYSTEM_LOGIN_SELECT.htm</URL>
        <line>?</line>
    </document>
    <types>
        <schema targetNamespace="SCRM4U_SERVICE" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" elementFormDefault="qualified">
            <complexType name="W_S_LOGIN_USER_INFO">
                <all>
                    <element name="W_V_USID" type="xsd:string">
                    </element>
                    <element name="W_V_USER_MEI" type="xsd:string">
                    </element>
                    <element name="W_V_USID2" type="xsd:string">
                    </element>
                    <element name="W_V_REM_PHR" type="xsd:string">
                    </element>
                    <element name="W_V_REM_RES" type="xsd:string">
                    </element>
                    <element name="W_V_USR_AST" type="xsd:string">
                    </element>
                    <element name="W_V_PSN_NO" type="xsd:string">
                    </element>
                    <element name="W_V_MENUROLE_ID" type="xsd:string">
                    </element>
                    <element name="W_V_USR_AST_NM" type="xsd:string">
                    </element>
                    <element name="W_N_USR_AST_PRI_ORD" type="xsd:long">
                    </element>
                    <element name="W_V_SCHOOL_ID" type="xsd:string">
                    </element>
                    <element name="W_V_EXM_NO" type="xsd:string">
                    </element>
                    <element name="W_V_SCRG_NO" type="xsd:string">
                    </element>
                    <element name="W_V_GRNTR_PSN_NO" type="xsd:string">
                    </element>
                </all>
            </complexType>
            <element name="WS_SYSTEM_LOGIN_SELECT.Execute">
                <complexType>
                    <sequence>
                        <element minOccurs="1" maxOccurs="1" name="P_v_userid" type="xsd:string"/>
                        <element minOccurs="1" maxOccurs="1" name="P_v_password" type="xsd:string"/>
                    </sequence>
                </complexType>
            </element>
            <element name="WS_SYSTEM_LOGIN_SELECT.ExecuteResponse">
                <complexType>
                    <sequence>
                        <element minOccurs="1" maxOccurs="1" name="P_s_login_user_info" type="tns1:W_S_LOGIN_USER_INFO"/>
                    </sequence>
                </complexType>
            </element>
        </schema>
    </types>
    <message name="WS_SYSTEM_LOGIN_SELECT.ExecuteSoapIn">
        <part name="parameters" element="tns:WS_SYSTEM_LOGIN_SELECT.Execute"/>
    </message>
    <message name="WS_SYSTEM_LOGIN_SELECT.ExecuteSoapOut">
        <part name="parameters" element="tns:WS_SYSTEM_LOGIN_SELECT.ExecuteResponse"/>
    </message>
    <portType name="WS_SYSTEM_LOGIN_SELECTSoapPort">
        <operation name="Execute">
            <input message="wsdlns:WS_SYSTEM_LOGIN_SELECT.ExecuteSoapIn"/>
            <output message="wsdlns:WS_SYSTEM_LOGIN_SELECT.ExecuteSoapOut"/>
        </operation>
    </portType>
    <binding name="WS_SYSTEM_LOGIN_SELECTSoapBinding" type="wsdlns:WS_SYSTEM_LOGIN_SELECTSoapPort">
        <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
        <operation name="Execute">
            <soap:operation soapAction="SCRM4U_SERVICEaction/AWS_SYSTEM_LOGIN_SELECT.Execute"/>
            <input>
                <soap:body use="literal"/>
            </input>
            <output>
                <soap:body use="literal"/>
            </output>
        </operation>
    </binding>
    <service name="WS_SYSTEM_LOGIN_SELECT">
        <port name="WS_SYSTEM_LOGIN_SELECTSoapPort" binding="wsdlns:WS_SYSTEM_LOGIN_SELECTSoapBinding">
            <soap:address location="http://192.168.2.148:8080/SCRM4U_SERVICE/servlet/aws_system_login_select"/>
        </port>
    </service>
</definitions>

演示代码：

<html>
<head>
</head>
<script language="javascript">...
function doService(userid, password) ...{

    //service.useService({webservice location},{webservice class name})
    service.useService("http://192.168.2.148:8080/SCRM4U_SERVICE/servlet/aws_system_login_select?wsdl","WS_SYSTEM_LOGIN_SELECT");
    //service.Service.callService({webmethod},{input parameters needed})
    service.WS_SYSTEM_LOGIN_SELECT.callService(showResult, "Execute", userid, password);
}

function showResult(result)...{

    alert(result.value.W_V_USER_MEI);
}
</script>
<body>
<div id="service" style="behavior:url(./webservice.htc)" ></div>
UserName:<input type="text" id="userid" name="userid">
<br/>
PassWord:<input type="text" id="password" name="password">
<br/>
<input type="button" value="callWebservice" onClick="doService(document.getElementById('userid').value,document.getElementById('password').value)"/>
</body>
</html>
注意：如果服务返回值类型是String,直接用result.value即可取到值。