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ajax XMLHttpRequest.readyStateÖÐStateµÄ"S"Òª´óд

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>xmlhttprequest ajax demo</title>
<mce:script type ="text/javascript" language ="javascript" ><!--
var req; //¶¨Òå±äÁ¿£¬ÓÃÀ´´´½¨xmlhttprequest¶ÔÏó
function creatReq() // ´´½¨xmlhttprequest,ajax¿ªÊ¼
{
var url="events_msg"; //ÒªÇëÇóµÄ·þÎñ¶ËµØÖ·
if(window.XMLHttpRequest) //·ÇIEä¯ÀÀÆ÷¼°IE7(7.0¼°ÒÔÉϰ汾)£¬ÓÃxmlhttprequest¶ÔÏó´´½¨
{
req=new XMLHttpRequest();
}
else if(window.ActiveXObject) //IE(6.0¼°ÒÔϰ汾)ä¯ÀÀÆ÷ÓÃactivexobject¶ÔÏó´´½¨,Èç¹ûÓû§ä¯ÀÀÆ÷½ûÓÃÁËActiveX,¿ÉÄÜ»áʧ°Ü.
{
req=new ActiveXObject("Microsoft.XMLHttp");
}

if(req) //³É¹¦´´½¨xmlhttprequest
{
req.open("GET",url,true); //Óë·þÎñ¶Ë½¨Á¢Á¬½Ó(ÇëÇó·½Ê½post»òget£¬µØÖ·,true±íʾÒì²½)
req.onreadystatechange = callback; //Ö¸¶¨»Øµ÷º¯Êý
req.send(null); //·¢ËÍÇëÇó
}
}

function callback() //»Øµ÷º¯Êý£¬¶Ô·þÎñ¶ËµÄÏìÓ¦´¦Àí£¬¼àÊÓresponse״̬
{
alert(req.readyState)
if(req.readyState==4) //ÇëÇó״̬Ϊ4±íʾ³É¹¦
{
if(req.status==200) //http״̬200±íʾOK
{
Dispaly(); //ËùÓÐ״̬³É¹¦£¬Ö´Ðд˺¯Êý£¬ÏÔʾÊý¾Ý
}
else //http·µ»Ø×´Ì¬Ê§°Ü
{
alert("·þÎñ¶Ë·µ»Ø×´Ì¬" + req.statusText);
}
}
else //ÇëÇó״̬»¹Ã»Óгɹ¦£¬Ò³ÃæµÈ´ý
{
document.getElementById("myTime").innerHTML="Êý¾Ý¼ÓÔØÖÐ";
}
}

function Dispaly() //½ÓÊÜ·þÎñ¶Ë·µ»ØµÄÊý¾Ý£¬¶ÔÆä½øÐÐÏÔʾ
{
document .getElementById ("myTime").innerHTML =req.responseText;
}


// --></mce:script&


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È·¶¨ ASP.NET AJAX ¹¦ÄÜÊÇ·ñ¿ÉÓà AJAXÊÇ·ñ°²×°

Private static readonly object ReflectionLock = new object();
Lock (ReflectionLock)
{
Type scriptManagerType =
Type.GetType(
"System.Web.UI.ScriptManager, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35",
false);
......

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AJAXÊÇAsynchronous JavaScript and XMLËõд¡£Õâ¸ö¸ÅÄî´ú±íµÄÊÇÒ»ÖÖ¼¼Êõ£¬µ±ÄúÔÚ˵“ÎÒÔÚÏîÄ¿ÖÐʹÓÃÁËAJAX¼¼Êõʱ”£¬Ö»ÊÇ´ú±íÁËÄúʹÓÿͻ§¶ËXMLHttpRequest¶ÔÏóÓë·þÎñÆ÷¶Ë½øÐÐÒ첽ͨÐÅ¡£²»¹ýÒòÎªËæ×ÅAJAX¼¼ÊõµÄÔËÓÃÍùÍù»á´øÀ´·á¸»µÄ¿Í»§¶ËЧ¹û£¬Òò´Ë¶ÔAJAX¼¼ÊõµÄ¹ãÒåÀí½âÒ²¿ÉÒÔÈÏΪÕâÊÇÒ»ÖÖ²Ù×÷ ......

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ajaxÏòservlet´«µÝÊý¾Ý£¬·µ»ØÂÒÂëµÄ½â¾ö·½·¨

ÒòΪAJAXĬÈϵÄÊÇUTF-8£¬ËùÒÔ½«JSPÒ³ÃæºÍºǫ́servletµÄ±àÂë¸ñʽ¶¼ÉèÖÃΪUTF-8×îºÃ£¬Ò²ÓÐÀûÓÚÒÔºóµÄÀ©Õ¹¡£
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response.setContentType("text/html");
 request.setCharacterEncoding("utf-8");
 response.setCharacterEncoding("UTF-8");
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Ajax¶¯Ì¬Éú³É±í

    ½ñÌìÓöµ½ÁËÒ»¸öÎÊÌ⣬JS²»Äܸù¾ÝAjax·µ»ØµÄDataTable¶¯Ì¬Éú³Étable,¸ñʽÈçÏ£º
   [Ajax.AjaxMethod()]
   public DataTable GetDataTable(string tablename)
   {
       DataTable Table=new DataTable();
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