Examples of AJAX usage in javascript _ javascript tips-js tutorial

This article mainly introduces the AJAX usage in javascript. Examples show Ajax usage skills for different browsers, which is of great practical value, for more information about AJAX in javascript, see the following example. Share it with you for your reference. The specific analysis is as follows:

Compatible with XMLHttpRequest objects:

Var xhr = null; if (window. XMLHttpRequest) {// non-IE browser xhr = window. XMLHttpRequest;} else if (window. activeXObject) {// IE browser try {// High Version, supported by msxml3.dll + xhr = new ActiveXObject ("Msxml2.XMLHTTP");} catch (e) {try {// low version, versions earlier than msxml2.6 use xhr = new ActiveXObject ("Microsoft. XMLHTTP ");} catch (e) {alert (" The ActiveXObject object cannot be created in IE browser! ");}}}

AJAX processing functions:

xhr.open("POST",url,true); xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); xhr.onreadystatechange=stateChangeHandler; xhr.send(); //var name="clf"; xhr.send(name); function stateChangeHandler(){   if(xhr.readystate==4&&xhr.status==200){    var obj = document.getElementById("targetDiv");   obj.innerHTML = xhr.responseText;   } }

I hope this article will help you design javascript programs.