jquery ajax如何传值给webservice

  

复制代码 <div class="button" id="btn2">            传入参数</div>   $(document).ready(function() {                 $("#btn2").click(function() {alert("mmmmm");         $.ajax({                                 type: "POST",                                 contentType: "application/x-www-form-urlencoded",                                 url: "WebService1.asmx/GetWish",                                 data: "{value1:'心想事成',value2:'万事如意',value3:'牛牛牛',value4:2009}",                                 dataType: 'json',                                 success: function(result) {             alert("nnnn");                   $('#dictionary').append(result);             },             error:   function(xhr,msg,erro){                 alert(xhr.responseText);             }           });                 });         });

WebService1代码

复制代码 [WebMethod]                 public string GetWish(string value1, string value2, string value3, int value4)                 {             return string.Format("祝您在{3}年里 {0}、{1}、{2}", value1, value2, value3, value4);                 }

现在这样不好用,提示
System.InvalidOperationException: 缺少参数: value1。 在 System.Web.Services.Protocols.ValueCollectionParameterReader.Read(NameValueCollection collection) 在 System.Web.Services.Protocols.HtmlFormParameterReader.Read(HttpRequest request) 在 System.Web.Services.Protocols.HttpServerProtocol.ReadParameters() 在 System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()
请问是什么原因啊

data:{} 是传键值对吧
要这样取？ context.request.form.get