.net 下用javascript調用webservice的話，要用到webservice behavior。下面以一個例子講解之，比較簡單
1 、首先，要創建一個webservice，比如
<%@ webservice language="c#" class=mymath %>
using system;
using system.web.services;
public class mymath {
[webmethod]
public int add(int a, int b)
{
return a + b;
}
[webmethod]
public int subtract(int a, int b)
{
return a - b;
}
}
然后發布，先得到其wsdl。
2、首先，我們要下載webbehavior.htc這個文件（可以到http://msdn.microsoft.com/downloads/samples/internet/behaviors/library/webservice/default.asp.）
去下載，然后放到你的web當前目錄下然后在要調用webserice的頁面中，修改如下
<body>
<div id="addservice" ></div>
</body>
這里我們將div id命名為有意義的名稱，并且指定style為 webservice行為。接著，我們要書寫javascript來調用webserice了：
首先，我們在javascript中，調用其wsdladdservice.useservice("http://localhost/services/math.asmx?wsdl","mymath");使用id.useservice(wsdll路徑,簡單的命名方式）;
我們之前設定的id是addservice，而為了給客戶端調用方便，我們這里起了名稱，叫mymath。而為了保證能正確調用webserice,必須在body里的onload事件里，馬上加載處理webservice調用的javascript,如下
<script language="javascript">
function init()
{
addservice.useservice("http://localhost/services/math.asmx?wsdl","mymath"); }
</script>
<body >
<div id="service" >
</div>
</body>
在上面，我們通過webservice行為，首先得到了返回webservice的wsdl,接下來我們要進行調用了，調用的格式如下： icallid = id.friendlyname.callservice([callbackhandler,] "methodname", param1, param2, ...);
這里id是我們在div里設置的id,而fridndbyname是我們剛才為方面而起的命，這里就是mymath了，而callbackhandler是使用回調函數的過程名，如果無設置的話，則默認是使用onresult所調用的方法來進行處理，下文會講到，而param1,,param2等則是說傳入的參數了，如：
<script language="javascript">
// all these variables must be global,
// because they are used in both init() and onresult().
var icallid = 0;
var inta = 5;
var intb = 6;
function init()
{
// establish the friendly name "mymath" for the webserviceurl
service.useservice("/services/math.asmx?wsdl","mymath");
// the following method doesn't specify a callback handler, so onwsresult() is used
icallid = service.mymath.callservice("add", inta, intb);
}
function onwsresult()
{
// if there is an error, and the call came from the call() in init()
if((event.result.error)&&(icallid==event.result.id))
{
// pull the error information from the event.result.errordetail properties
var xfaultcode = event.result.errordetail.code;
var xfaultstring = event.result.errordetail.string;
var xfaultsoap = event.result.errordetail.raw;
// add code to handle specific error codes here
}
// if there was no error, and the call came from the call() in init()
else if((!event.result.error) && (icallid == event.result.id))
{
// show the arithmetic!
alert(inta + ' + ' + intb + ' = ' + event.result.value);
}
else
{
alert("something else fired the event!");
}
}
</script>
<body >
<div id="service" onresult="onwsresult()">
</div>
</body>
注意，用onresult方式返回的話，要在div部分的onresult中指定處理的方法，這里是用onwsresult()方法，其中根據返回的信息來判斷是否出錯，出錯的話則顯示。
如果用回調的話，則如下處理
<script language="javascript">
// all these variables must be global,
// because they are used in both init() and onresult().
var icallid = 0;
var inta = 5;
var intb = 6;
function init()
{
// establish the friendly name "mymath" for the webserviceurl
service.useservice("/services/math.asmx?wsdl","mymath");
// the following uses a callback handler named "mathresults"
icallid = service.mymath.callservice(mathresults, "add", inta, intb);
}
function mathresults(result)
{
// if there is an error, and the call came from the call() in init()
if(result.error)
{
// pull the error information from the event.result.errordetail properties
var xfaultcode = result.errordetail.code;
var xfaultstring = result.errordetail.string;
var xfaultsoap = result.errordetail.raw;
// add code to handle specific error codes here
}
// if there was no error
else
{
// show the arithmetic
alert(inta + ' + ' + intb + " = " + result.value);
}
}
</script>
<body >
<div id="service" >
</div>
</body>
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