Native Ajax invoke data instance to explain _ajax related

Because of the popularity of jquery, it is now using jquery encapsulated Ajax, because the browser compatibility problem is solved, which is tantamount to the programmer to remove a heart scourge, but not native Ajax disappeared, and I feel that the original Ajax have a good understanding of the The following is an AJAX data invocation of the example code, very simple, beginners can refer to. The code is as follows:
A. Compatible browser section

function Xmlhttpr ()
{ 
 var xmlhttp; 
 if (window. XMLHttpRequest)
 { 
 xmlhttp=new xmlhttprequest (); 
 } 
 else
 { 
 try
 {
  xmlhttp=new activexobject ("Msxml2.xmlhttp")
 } 
 catch (e)
 { 
  Try{xmlhttp=new ActiveXObject ("Microsoft.XMLHTTP");}
  catch (e) {return null;} 
 }} return XMLHTTP; 

The above can return an object that is compatible with each browser.
two. Instance code

var ajaxel=new Object (); Ajaxel is a custom namespace, ajaxel.contentload=function (URL) {//ie browser, enables caching, where the URL is added to the Date field to prevent IE from using caching, and of course you can use Math.random 
 () produce and getTime similar effects; url+= "? date=" +new date (). GetTime (); 
 This.req=null; 
 This.url=url;  
 This callback function is the update function on the page of the data, This.onload=function () {//domel is the DOM element with the ID #test; var domel=document.getelementbyid ("Test"); 
 In addition to using the ResponseText property, you can also use Responsexml to obtain a data table; domel.innerhtml=this.req.responsetext; } this. 
Xmlhttp (URL); } ajaxel.contentload.prototype={xmlhttp:function (URL) {if (window). 
 XMLHttpRequest) {this.req=new XMLHttpRequest (); else {try{this.req=new ActiveXObject ("Msxml2.xmlhttp")} catch (e) {try{this.req=new ActiveXObject ("Micro Soft. 
  XMLHTTP "); 
 catch (e) {return null;} 
 } if (this.req) {var xmlr=this; 
  This.req.onreadystatechange=function () {if (xmlr.req.readystate===4) {xmlR.onload.call (XMLR); 
 } this.req.open ("Get", url,true); 
 This.req.send (NULL); }} var xmle=New Ajaxel.contentload ("main.php"); 
 

Three. Code in PHP

echo "now! Time is: ". Date (" H:i:s a Y ");

The above is about the native Ajax call data examples, I hope to help you learn.