Share the code for creating a simple instance Using Ajax,

Share the code for creating a simple instance Using Ajax,

XmlHttp is a set of APIs that can be transmitted over http or receive XML and other data in Javascript, VbScript, Jscript, and other scripting languages. XmlHttp can be used to update part of the webpage without refreshing the entire page. Almost all browsers support XMLHttpRequest objects, which are the core technology of Ajax applications.
The js Code is as follows:

<Html> 
Explanation of the above js Code:
(1). XMLHttpRequest objectOnreadystatechange attribute. When a request is sent to the server, the task needs to be executed. When the readyState changes, the onreadystatechange event is triggered.
(2). XMLHttpRequest objectThe readyState attribute of, containing the status of XMLHttpRequest (0 ~ 4 ).

 
 
0: the request is not initialized.
 
 
1: The server connection has been established.
 
 
2: The request has been received
 
 
3: The request is being processed
 
 
4: The request is complete and the response is ready.
 

(3). open (method, url, async) method: Specifies the request type, URL, and whether to asynchronously process the request.
(4). send (content)Send a request to the server.
The above is the code for creating simple Ajax instances. I hope it will be helpful for your learning. You can also create simple Ajax instances by yourself.
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