How to create an Ajax instance

Editor to share with you how to create an example of 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!

XmlHttp is a set of API that can transmit or receive XML and other data through http protocol in scripting languages such as Javascript, VbScript, Jscript and so on. The greatest use of XmlHttp is that it can update parts of a web page without refreshing the entire page. Almost all browsers support XMLHttpRequest object, which is the core technology of Ajax application.

The js code is as follows:

New Document / * * create XMLHttpRequest objects * IE7+, Firefox, Chrome, Safari and Opera are all built-in XMLHttpRequest objects * IE5,IE6 uses ActiveX objects, xmlHttp = new ActiveXObject ("Microsoft.XMLHTTP") * * / function createXMLHttpRequest () {var xmlHttp; if (window.XMLHttpRequest) {xmlHttp = new XMLHttpRequest ();} else {xmlHttp = new ActiveXObject ("Microsoft.XMLHTTP") } xmlHttp.onreadystatechange = function () {if (xmlHttp.readyState = = 4) {if (xmlHttp.status = = 200) {document.getElementById ("myDiv") [xss_clean] = xmlHttp.responseText;}} else {document.getElementById ("myDiv") [xss_clean] = "loading...";}}; / / relax request xmlHttp.open ("GET", "test.php", true) from the server; xmlHttp.send ();}