How to learn Ajax
Editor to share with you how to learn Ajax, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!
The code is as follows:
/ / step 1: create a XMLHttpRequest object
Var http_request
Try
{
Http_request = window.ActiveXObject ("Microsoft.XMLHTTP")
} catch (e)
{
Try
{
Http_request = new XMLHttpRequest ()
} catch (e)
{
Alert ("your browser does not support XMLHttpRequest")
}
}
/ / step 2: specify the submitted url
Http_request.open ("get", "url", "true"); / / get is the submission method, and true is to specify asynchronous interaction with the server.
/ / step 3: process the data returned by the server
Http_request.onreadystatechange = function () / / callback function, which will be called 4 times in total. The readtState changes from 0-> 1-> 2-> 3-> 4 (completed).
{
If (http_request.readyState = = 4) / / Server processing completed
{
If (http_request.status = = 200) / / client processing completed
{
/ / processing segment
}
}
}
/ / step 4: send parameters
Http_request.send (null); / / send parameters
The above is all the contents of the article "how to learn Ajax". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!
