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µÚÒ»¸öAjax ʵÀý

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>¼òµ¥µÄÓ¦ÓÃXMLHttpRequestÀý×Ó</title>
<mce:script type="text/javascript"><!--
var req = null; // XMLHttpRequest¶ÔÏó
var console = null; // Êä³ö½á¹ûµÄDIV¶ÔÏó

/* ÒÔÏÂËĸö¶ÔÏóÊÇÒì²½´«Êä¹ý³ÌÖеÄËÄÖÖ״̬ */
var READY_STATE_UNINITIALIZED = 0;
var READY_STATE_LOADING = 1;
var READY_STATE_LOADED = 2;
var READY_STATE_INTERACTIVE = 3;
var READY_STATE_COMPLETE = 4;

/*
* ·¢ËÍÒ»¸öÒì²½µÄÇëÇó
* ²ÎÊý: url Ä¿±êµØÖ·, params·¢Ë͵IJÎÊý, HttpMethod ·½·¨¿ÉÒÔGET»òPOST
* µÚ¶þ¸öµÚÈý¸ö²ÎÊýÒ»°ã¿ÉÒÔÊ¡ÂÔ,µ±µÚÈý¸ö²ÎÊýÊ¡ÂÔʱHttpMethodĬÈÏΪGET
* µ±ÇëÇó·¢ËÍÍê³Éʱµ÷ÓÃcallbackº¯Êý½øÐвÙ×÷
*/
function sendRequest( url, params, HttpMethod ){
if( !HttpMethod ){
HttpMethod = "GET";
}

req = initXMLHTTPRequest();
if( req ){
req.onreadystatechange = callback;
req.open( HttpMethod, url, true );
req.setRequestHeader( "Content-Type", "application/x-www-form-urlencoded" );
req.send( params );
}
}

/*
* ½¨Á¢ÓÃÓÚÒì²½´«ÊäµÄXMLHttpRequest¶ÔÏó
*/
function initXMLHTTPRequest(){
var xRequest = null;
if( window.XMLHttpRequest ){
xRequest = new XMLHttpRequest(); // Mozilla, Sofira, Firefox
}
else if( window.ActiveXObject ){
xRequest = new ActiveXObject("Microsoft.XMLHTTP"); // IE
}
return xRequest;
}

/*
* »Øµ÷º¯Êý
* ½«´¦Àí¹ý³Ì¼°Íê³Éʱ·µ»ØµÄ½á¹ûÎı¾½»¸øtoConsole½øÐд¦Àí
*/
function callback(){
var ready = req.readyState;
var data = null;
if( ready == READY_STATE_COMPLETE ){
data = req.responseText;
}
else{
data = "loading...[" + ready + "]";
}
toConsole( data );
}

/*
* ÏÔʾ½á¹û
* ÔÚDOMÖÐÕÒµ½IDΪconsoleµÄÔªËØ,½«ÏÔʾ½á¹û×·¼Óµ½consoleÖÐ
*/
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Struts2 Jquery Json ʵÏÖAJax±íµ¥ÑéÖ¤

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