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a.¼ÌÐøÉÏÃæ²½Öè
2)×¢²á»Øµ÷º¯Êý,ֻдº¯ÊýÃû³Æ(Èç¹û¼ÓÁËÀ¨ºÅ£¬ÄÇô¾Í°Ñº¯Êý·µ»ØÖµ×¢²á¸ø»Øµ÷º¯Êý)
xmlHttp.onreadystatechange = callback;
3)ÉèÖÃÁ¬½ÓÐÅÏ¢
//µÚÒ»²ÎÊýÊÇHttpÇëÇó·½Ê½£¬Ò»°ãÑ¡Ôñget¡¢post
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//µÚÈý¸ö²ÎÊý±íʾÒì²½»¹ÊÇͬ²½£¬true±íʾÒì²½
xmlHttp.open("GET", "ajaxserver?name="+userName, true);
4)·¢ËÍÊý¾Ý¡¢¿ÉÊÇÓë·þÎñÆ÷½øÐн»»¥
//ͬ²½·½Ê½Ï£¬send»áÔÚ·þÎñÆ÷Êý¾Ý»ØÀ´ºó²ÅÖ´ÐÐÍê
//Òì²½·½Ê½Ï£¬send»áÁ¢¼´Ö´ÐÐÍê
xmlHttp.send(null);
5)½ÓÊÕÏìÓ¦Êý¾Ý
function callback(){
//Åж϶ÔÏó״̬½»»¥Íê³É
if (xmlHttp.readyState == 4){ 
//ÅжÏhttp½»»¥ÊÇ·ñ³É¹¦£¬http״̬Âë200
if(xmlHttp.status == 200){
//»ñµÃ·þÎñÆ÷·µ»ØµÄ´¿Îı¾Êý¾Ý
var responseText = xmlHttp.responseText;
//ÏÔʾµ½½çÃæ
document.getElementById("result").innerHTML = responseText;
}
}
}
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a.ûʲô¿ÉдµÄ£¬¶¼ÊÇһЩÈí¼þµÄ½éÉÜ
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b.Ñ¡Ôñpost·½Ê½Ìá½»Êý¾Ý
xmlHttp.open("POST", "ajaxserver", "true");
//±ØÐëÉèÖÃhttpµÄÇëÇóÍ·
xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlHttp.send("name=" +userName);
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a.·þÎñÆ÷¶ËÐ޸ģ¬httpServletResponse.setContentType("text/xml;charset-utf-8");
b.¿Í»§¶ËÐ޸ģ¬var domObj = xmlHttp.responseXML;
//<message>123122</message>
//getElementsByTagName();ËùÓÐmessage½Úµã£¬·µ»ØÒ»¸öÊý×é
var mgeNodes = domObj.getElementsByTagName("message");
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var textNode = mgeNodes[0].firstChild;
var responseText = textNode.nodeValue;
c.Èç¹û·þÎñÆ÷setContentType("text/html;charset-utf-8");
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ClientScript.RegisterClientScriptBlock(this.GetType(), "", "<script>alert('×Ô¼º¿´×Å°ì!')</script>");
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http_request.open("POST",url,true);
http_request.setRequestHeader('Content-Type',
'application/x-www-form-urlencoded');
http_request.send("action="+strName+"&val="+val);   ......

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