Processing Method When JQuery ajax returns JSON

Recently, when using JQuery's ajax method, the returned data is required to be json data. The following problems are encountered during the processing process: when using different methods to generate json data, at $. the following describes how to process the ajax method. Because I am using asp.net, all pages are processed. net! Other methods should be the same.
First, provide The json Data to be transmitted: [{"demoData": "This Is The JSON Data"}]
1. Use a normal aspx page for processing
I think this method is the easiest to handle. Let's look at the following code.
$. Ajax ({
Type: "post ",
Url: "Default. aspx ",
DataType: "json ",
Success: function (data ){
$ ("Input # showTime"). val (data [0]. demoData );
},
Error: function (XMLHttpRequest, textStatus, errorThrown ){
Alert (errorThrown );
}
});

Here is the code for passing data in the background
 
Response. Clear ();
Response. Write ("[{\" demoData \ ": \" This Is The JSON Data \ "}]");
Response. Flush ();
Response. End ();
This processing method directly parses the transmitted data into json data. That is to say, the front-end js code here may directly parse the data into json object data instead of string data, for example, data [0]. demoData: The json object data is directly used here.
2. Use webservice (asmx) for processing
This method does not treat the transmitted data as json object data, but as a string for processing. The following code:
$. Ajax ({
Type: "post ",
Url: "JqueryCSMethodForm. asmx/GetDemoData ",
DataType: "json",/* This sentence can be used but not affected */

ContentType: "application/json; charset = UTF-8 ",
Success: function (data ){
$ ("Input # showTime"). val (eval ('+ data. d +') [0]. demoData );

// There are two data conversion methods. The two processing methods have the same effect. // $ ("input # showTime "). val (eval (data. d) [0]. demoData );

},
Error: function (XMLHttpRequest, textStatus, errorThrown ){
Alert (errorThrown );
}
});
The following is the asmx method code.
[WebMethod] www.2cto.com
Public static string GetDemoData (){
Return "[{\" demoData \ ": \" This Is The JSON Data \ "}]";
}
The processing method here treats the transmitted json data as a string, and the data must be processed eval so that it can become a real json object data,
3. Use the ashx file for processing.
This method is the same as the normal aspx page processing, so I will not explain it here.
Author: xiahuawuyu