客户端访问Web Service方法的一个细节

[ScriptService]
public class DemoService  : System.Web.Services.WebService
{
    [WebMethod]
    public string DemoMethod()
    {
        return "Hello World";
    }    
} 网管网www.bitscn.com 

var DemoService = function()
{
    DemoService.initializeBase(this);
    this._timeout = 0;
    this._userContext = null;
    this._succeeded = null;
    this._failed = null;
}
DemoService.prototype =
{
    DemoMethod:function(succeededCallback, failedCallback, userContext)
    {
        return this._invoke(
            DemoService.get_path(),
            'DemoMethod',
            false,
            {},
            succeededCallback,
            failedCallback,
            userContext);
    }
}
DemoService.registerClass('DemoService',Sys.Net.WebServiceProxy);
... 
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function Sys$Net$WebServiceProxy$_invoke(
    servicePath, methodName, useGet, params, onSuccess, onFailure, userContext) {
    // validation omitted
    ...
    return Sys.Net.WebServiceProxy.invoke(
        servicePath,
        methodName,
        useGet,
        params,
        onSuccess,
        onFailure,
        userContext,
        this.get_timeout());
} 
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Sys.Net.WebServiceProxy.invoke = function Sys$Net$WebServiceProxy$invoke(
    servicePath, methodName, useGet, params, onSuccess, onFailure, userContext, timeout) {
    // validation omitted
    ...
    // Create a web request to make the method call
    var request = new Sys.Net.WebRequest();
    // preparing request omitted
    ...
    request.invoke();
    function onComplete(response, eventArgs) {
        // method body omitted
    }
    return request;
} 中国网管论坛bbs.bitsCN.com 

var request = DemoService.DemoMethod(onComplete); 中国网管论坛bbs.bitsCN.com 

request.abort(); 网管下载dl.bitscn.com 

DemoService._staticInstance = new DemoService();
...
DemoService.DemoMethod = function(onSuccess,onFailed,userContext)
{
    DemoService._staticInstance.DemoMethod(onSuccess,onFailed,userContext);
} 
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var request = DemoService._staticInstance.DemoMethod(onComplete); 
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var demoService = new DemoService();
var request = demoService.DemoMethod(onComplete); 中国网管联盟bitsCN.com