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  var xmlHttpReq = null;
if (window.XMLHttpRequest) //Mozilla ä¯ÀÀÆ÷
{
¡¡¡¡¡¡ xmlHttpReq = new XMLHttpRequest();
¡¡¡¡}
¡¡ else if (window.ActiveXObject) // IEä¯ÀÀÆ÷
{
try
{
xmlHttpReq = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
try
{
xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e)
{
alert("ÄúµÄä¯ÀÀÆ÷²»Ö§³ÖAJAX£¡") ;
}
} ¡¡¡¡
¡¡ }
else
{
alert("ÄúµÄä¯ÀÀÆ÷²»Ö§³ÖAJAX£¡") ;
}
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 xmlHttpReq.open("POST","http://localhost///6gold/home_validate.php",true);
xmlHttpReq.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xmlHttpReq.onreadystatechange = function()
{
if (xmlHttpReq.readyState == 4)
{
if (xmlHttpReq.status == 200)
{
document.getElementById('span_' + key).innerHTML = xmlHttpReq.responseText;
}
}
}
xmlHttpReq.send("personid=<?php echo($_SESSION['uid']); ?>" + "&key=" + key + "&value=" + value);
ÕâÀïÓõÄÊÇPOST·½·¨£¬ÈôÓÃGET£¬×îºóÒ»¾äsend¿ÉÒÔ¸ÄΪ
xmlHttp.send(null);
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xmlHttp.send("");
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xmlHttpReq.onreadystatechangeʼþ  ҪдÔÚ xmlHttpReq.send()ʼþ֮ǰ¡£ÒòΪÈç¹ûÏÈsend£¬ÔÙ²¶×½onreadystatechangeµÄ»°£¬send¿ìµÄ»°£¬readystateÒѾ­±äΪ4£¨³É¹¦·µ»Ø£©ºó²Å¿ªÊ¼²¶×½readystatechangeʼþ£¬»á²¶×½²»µ½¡£
xmlHttpReq.responseTextµÄÄÚÈÝËƺõÊÇ·þÎñ¶ËÒ³ÃæµÄ<body></body>¼äµÄÄÚÈÝ£¬²»ÊǺÜÈ·¶¨¡£
get·½Ê½´«ÖÐÎÄËƺõ»á³ö±¨´í£¬¸ÄÓÃpost´«ÖÐÎÄ£¬¿Í»§¶Ë->·þÎñ¶Ë,ûÓÐÎÊÌ⣻·þÎñ¶Ë->Êý¾Ý¿â(sql server2005)->¿Í»§¶Ë£¬¾Í»á³öÏÖÂÒÂ룬²»ÖªµÀÄÄÀïÓÐÎÊÌ⣬ÎÒÊÇÔÚ·þÎñ¶Ëת»»ÁËϱàÂë¸ã¶¨µÄ£ºecho mb_convert_encoding($msg,"utf-8","gb2312");


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jQuery ÊÇÒ»¸öJavaScript ¿â£¬ËüÓÐÖúÓÚ¼ò»¯ JavaScript™ ÒÔ¼° Asynchronous JavaScript + XML (Ajax) ±à³Ì¡£ÓëÀàËÆµÄ JavaScript ¿â²»Í¬£¬jQuery ¾ßÓжÀ ......

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1.  http://hi.baidu.com/lshun/blog/item/2378b4c36fdef455b219a85b.html
CODE:
<?xml version="1.0" encoding="UTF-8"?>
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