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1 JavaScript;
2 CSS£¨Ò³ÃæÑùʽ£©;
3 DOM£¨Ò³Ãæ¾Ö²¿¹ÜÀí£©;
4 xmlHttpRequest£¨Òì²½¶ÔÏó£©;
5 Òì²½¶ÔÏóÁ´½Ó·þÎñÆ÷;
var xmlHttp;
var xmlhttpObj = ["MSXML2.XmlHttp.5.0","MSXML2.XmlHttp.4.0","MSXML2.XmlHttp.3.0","MSXML2.XmlHttp","Microsoft.XmlHttp"];//ΪµÄÊÇie fireFox¼æÈÝ
function createXMLHttpRequest(){
if(window.ActiveXObject){
for(i=0;i<xmlhttpObj.length;i++)
{ s
xmlHttp = new ActiveXObject(xmlhttpObj[i]);
if(xmlHttp)
{
break;
}
alert(xmlhttpObj[i]);
}
}
else if(window.XMLHttpRequest){
xmlHttp=new XMLHttpRequest();
}else{
alert("ÔÝʱ²»ÄÜ´´½¨XMLHttpRequest¶ÔÏó");
}
return xmlHttp?xmlHttp:false;
}
======================================================================
xmlHttp.open("GET","AjaxTest.action",true);         //"GET"´«Öµ·½·¨£¬"AjaxTest.action"Òì²½ÇëÇóµÄµØÖ·£¬true±íʾÒì²½
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xmlHttp.onreadystatechange=function(){        //·þÎñÆ÷״̬·¢Éú±ä»¯Ê±µ÷Óô˺¯Êý¡£
if(xmlHttp.readyState==4&&xmlHttp.status==200)       //ÅжÏÒì²½½»»¥ÊÇ·ñ³É¹¦
//do something
}
send()·¢ËÍ
xmlHttp.send(null);  //get·½·¨Ö»Ðèsend£¨null£© post ¾ÍÐèÒª½«´«µÄ²ÎÊýдµ½Àï³É Àý×Ó£ºxmlHttp.send(parmaters); 
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