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function createXMLHttpRequest(){     
if(window.ActiveXObject){     
        http = new ActiveXObject("Microsoft.XMLHTTP");     
        }else if(window.XMLHttpRequest){     
                http=new  XMLHttpRequest();
        }
}
function send(){
        createXMLHttpRequest()
        url="b.asp";//µ÷ÓÃÒ³Ãæ!
        http.open("POST",url,true);//²ÉÓÃPOST·½Ê½£¬Í¬²½·½Ê½·¢ËÍ
        http.setRequestHeader('Content-type','application/x-www-form-urlencoded');  
        http.onreadystatechange=loadings
        http.send(null);//¹¹ÔìÒ»¸öXML¶ÔÏó²¢·¢ËÍ
}
function  loadings(){     
        if(http.readyState==4){
                if(http.status==200){
                        alert("¼ÓÔØÍê³É")//Õâ¸öµØ·½²»ÖªµÀÔõôȥ»ñµÃb.aspµÄÐÅÏ¢,»ñÈ¡²»µ½
                               // alert(http.responseText);//ÕâÑùºÃÏóÒ³Ãæ´ò³öÀ´Ã»Ê²Ã´Óô¦ÒòΪȫÊÇhtml´úÂë/
                                }else{
                        alert("¼ÓÔØÊ§°Ü")
                }
        }
}


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php µÄ ajax ʵÏÖ

<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
<input type="button" onclick="test();" value="Ìá½»"/>
<script type="text/javascript">
    function test(){
            var valid = {
& ......

ÍêÃÀAjaxÀà,Ö§³Öʼþ

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<!--
// author:±¼ÌÚµÄÐÄ
//     qq:7180001
function Ajax(OnError,OnState,OnDownloadEnd)
{
        this.ErrorStr                 = null;
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AJAXÍøÒ³×¥È¡¹¤¾ß Krabber 0.2.9Õýʽ·¢²¼

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IDE£ºVisual Web Developer 2008 Express Edition
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Public Function GetCompletionList(ByVal prefixText As String, ByVal coun ......
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