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  Ajax×é³É£º
1 JavaScript;
2 CSS£¨Ò³ÃæÑùʽ£©;
3 DOM£¨Ò³Ãæ¾Ö²¿¹ÜÀí£©;
4 xmlHttpRequest£¨Òì²½¶ÔÏó£©;
5 Òì²½¶ÔÏóÁ´½Ó·þÎñÆ÷;
var xmlHttp;
var xmlhttpObj = ["MSXML2.XmlHttp.5.0","MSXML2.XmlHttp.4.0","MSXML2.XmlHttp.3.0","MSXML2.XmlHttp","Microsoft.XmlHttp"];//ΪµÄÊÇie fireFox¼æÈÝ
function createXMLHttpRequest(){
if(window.ActiveXObject){
for(i=0;i<xmlhttpObj.length;i++)
{ s
xmlHttp = new ActiveXObject(xmlhttpObj[i]);
if(xmlHttp)
{
break;
}
alert(xmlhttpObj[i]);
}
}
else if(window.XMLHttpRequest){
xmlHttp=new XMLHttpRequest();
}else{
alert("ÔÝʱ²»ÄÜ´´½¨XMLHttpRequest¶ÔÏó");
}
return xmlHttp?xmlHttp:false;
}
======================================================================
xmlHttp.open("GET","AjaxTest.action",true);         //"GET"´«Öµ·½·¨£¬"AjaxTest.action"Òì²½ÇëÇóµÄµØÖ·£¬true±íʾÒì²½
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onreadystatechangeʼþ
xmlHttp.onreadystatechange=function(){        //·þÎñÆ÷״̬·¢Éú±ä»¯Ê±µ÷Óô˺¯Êý¡£
if(xmlHttp.readyState==4&&xmlHttp.status==200)       //ÅжÏÒì²½½»»¥ÊÇ·ñ³É¹¦
//do something
}
send()·¢ËÍ
xmlHttp.send(null);  //get·½·¨Ö»Ðèsend£¨null£© post ¾ÍÐèÒª½«´«µÄ²ÎÊýдµ½Àï³É Àý×Ó£ºxmlHttp.send(parmaters); 
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ajaxTest:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Trans


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// AJAXÀà
function AJAXRequest() {
var xmlObj = false;
var CBfunc,ObjSelf;
ObjSelf=this;
try { xmlObj=new XMLHttpRequest; }
catch(e) {
try { xmlObj=new ActiveXObject("MSXML2.XMLHTTP"); }
catch(e2) {
try { xmlObj=new ActiveXObject("Microsoft.XMLHTTP"); }
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php ajax debug method make log in a text file

log into file
//
ob_start();
echo "<pre>";
print_r($data);
echo "</pre>";
$a=ob_get_contents();
//DAL::remove("insert into mytest(vvv) values('$a')");
$filename = "file.txt";
$file = fopen($filename, "w") ......

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[http://www.okajax.com/a/200905/10ajax_framework_2.html]
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<?php
if(isset($_GET['do']) && $_GET['do']==='ajax')
{
exit("{msg:'Hello World!'}");
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head& ......
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