javascript调用webservice

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net 下用javascript调用webservice的话，要用到webservice behavior。下面以一个例子讲解之，比较简单

1 、首先，要创建一个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;}}

然后发布，先得到其wsdl。
2、首先，我们要下载webbehavior.htc这个文件（可以到http://msdn.microsoft.com/downloads/samples/internet/behaviors/library/webservice/default.asp.）
去下载，然后放到你的web当前目录下
然后在要调用webserice的页面中，修改如下
<body>
<div id="addservice" style="behavior:url(webservice.htc)"></div>
</body>
这里我们将div id命名为有意义的名称，并且指定style为 webservice行为。接着，我们要书写javascript来调用webserice了：
首先，我们在javascript中，调用其wsdladdservice.useservice("http://localhost/services/math.asmx?wsdl","mymath");
使用id.useservice(wsdll路径,简单的命名方式）;
我们之前设定的id是addservice，而为了给客户端调用方便，我们这里起了名称，叫mymath。而为了保证能正确调用webserice,必须在body里的onload事件里，马上加载处理webservice调用的javascript,如下

<script language="javascript">function init(){addservice.useservice("http://localhost/services/math.asmx?wsdl","mymath"); }</script><body onload="init()"><div id="service" style="behavior:url(webservice.htc)"></div></body>

在上面，我们通过webservice行为，首先得到了返回webservice的wsdl,接下来我们要进行调用了，调用的格式如下： icallid = id.friendlyname.callservice([callbackhandler,] "methodname", param1, param2, ...);
这里id是我们在div里设置的id,而fridndbyname是我们刚才为方面而起的命，这里就是mymath了，而callbackhandler是使用回调函数的过程名，如果无设置的话，则默认是使用onresult所调用的方法来进行处理，下文会讲到，而param1,,param2等则是说传入的参数了，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 webserviceurlservice.useservice("/services/math.asmx?wsdl","mymath");// the following method doesnt specify a callback handler, so onwsresult() is usedicallid = 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 propertiesvar 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 onload="init()"><div id="service" style="behavior:url(webservice.htc)" onresult="onwsresult()"></div></body>

注意，用onresult方式返回的话，要在div部分的onresult中指定处理的方法，这里是用onwsresult()方法，其中根据返回的信息来判断是否出错，出错的话则显示。
如果用回调的话，则如下处理

<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 webserviceurlservice.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 propertiesvar 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 errorelse{// show the arithmeticalert(inta + + + intb + " = " + result.value);}}</script><body onload="init()"><div id="service" style="behavior:url(webservice.htc)"></div></body>