Jquery+ajax Call WebService Instance

Jquery+ajax Call WebService Instance
This article is using the ASP tutorial. NET WebService and jquery Ajax to do an AJAX example

<script language= "Web Effects" >
$ ("document"). Ready (function () {
$ ("#mmlog"). Append ("Data"); This sentence is valid and there is data at the specified location on the page
$ ("#btn"). Click (function () {
Alert ("SDFSDF");/effective
$.ajax ({
Async:false,
Type: "Post",
ContentType: "Application/json",
URL: "Webservice.asmx/helloworld",
Data: "{}",
DataType: "XML",
Cache:false,
Success:function (data, Textstatus, XMLHttpRequest) {
Alert ("OK"); Type: "Get", at least 1 times inside 10 times invalid; Type: "POST", invalid
$ ("#mmlog"). Append ("Data"); Showed up and disappeared again.
alert (data);
},
Error:function (xml,status) {alert (status);}//type: "Post", status= "error"
});
});

})
</script>

Webservic.asmx file

Public class Dataservice:system.web.services.webservice {

  public DataService () {

 //If you are using a design component, uncomment the following line  
 //initializecomponent (); 
 }
  [WEBMETHOD]
  public string HelloWorld () {
  return ' Hello World ';
 }

  [WebMethod]
  public int AppendData (string Sdev, String x, string y)
  {
  string s = String.Format ("INSERT INTO Zry_ Current (Zdev,zx,zy) values (' {0} ', {1},{2}) ", Sdev, X, y);
  return accesshelper.executenonquery (s);
 }

  [WebMethod]
  public string ReadData (string Sdev, String Dayid)
  {
  string s = Stri Ng.format ("Select Zx,zy from zry_current where zdev= ' {0} ' and Zday={1}", Sdev, Dayid);
  DataSet ds = Accesshelper.executedataset (s);
  Ds.datasetname = "zry_current";
  return Ds.getxml ();
 }
}