异步调用webservice

Code
<asp:ScriptManager ID="ScriptManager1" runat="server">
                <Services>
                    <asp:ServiceReference Path="WebService.asmx" />
                </Services>
            </asp:ScriptManager>
<script type="text/javascript">
                function call()
                {
                    WebService.HelloWorld("sw", onSucceed);
                }
                function onSucceed(response)
                {
                    alert(response.toString());
 }
            </script>

 

 

Code
/// <summary>
/// WebService 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ScriptService]
public class WebService : System.Web.Services.WebService {

    public WebService () {

        //如果使用设计的组件，请取消注释以下行 
        //InitializeComponent(); 
    }

    [WebMethod]
    public string HelloWorld(string str) {
        return "Hello World" + str;
    }
   
}