How to use getJSON in JQuery_jquery

JSONP (JSON with Padding - filling json data, which is the commonly used json cross-domain method) is used here: using the script tag and calling a specific src address to execute a client-side js function and generate relative data on the server side ( JSON format) and pass it to the client's js function in the form of parameters and execute this function, provided that the server-side data output support is required. JSONP applications are supported after JQuery 1.2.

JSON is plain text with a simple bracket structure, so many channels can exchange JSON messages. Because of the same-origin policy restrictions, we cannot use XMLHttpRequest when communicating with external servers. JSONP is a method that can bypass the same-origin policy, that is, by using JSON combined with the <script> tag to directly return executable JavaScript function calls or JavaScript objects from the server. </script>

The key role in the entire calling process is jsoncallback=?,When calling on the client, you need to add parameters to the request address: jsoncallback=?; at the same time, the server needs to pass the value of jsoncallback back as the method name.

Server code:

Copy code The code is as follows:

protected void Page_Load(object sender, EventArgs e)
{
Response.Write(Request.QueryString["jsoncallback"] "({name:'test'})");
}

html page call:

Copy code The code is as follows: