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/**
* »ñµÃXMLHttpRequest¶ÔÏó
*/
function createXHR(){
    var x=[function(){return new ActiveXObject("Msxm12.XMLHTTP");},function(){return xmhttp=new ActiveXObject("Microsoft.XMLHTTP");},
            function(){return new XMLHttpRequest();}];
    for (var i=0; i<x.length; i++) {
        try {
            return (x[i])();
        } catch (e) {
        }
    };
}
·½·¨Ò»:
//´´½¨Ò»¸ö²¼¶ûÐͱäÁ¿,ÓÃÀ´¼ì²éÊÇ·ñΪºÏ·¨µÄIEʵÀý
var xmlreq = false;
//¼ì²éÊÇ·ñʹÓõÄÊÇIE
try {
//Èç¹ûJavaScriptµÄ°æ±¾´óÓÚ5
xmlreq = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e1) {
// Èç¹û²»ÊÇ,ÔòʹÓÃÀϰ汾µÄActiveX¶ÔÏóÀ´¼ì²é
try {
//Èç¹ûʹÓõÄÊÇIEä¯ÀÀÆ÷
xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {
// ·ñÔò¿Ï¶¨Ê¹ÓõÄÊÇ·ÇIEä¯ÀÀÆ÷
        xmlreq=false;
}
}
}
//Èç¹ûʹÓõÄÊÇ·ÇIEä¯ÀÀÆ÷,Ôò´´½¨Ò»¸ö¸Ã¶ÔÏóµÄJavaSriptʵÀý
if(!xmlreq && typeof XMLHttpRequest!='undefined'){
   xmlreq=new XMLHttpRequest();
}
·½·¨¶þ:
//´´½¨Ò»¸ö²¼¶ûÐͱäÁ¿,ÓÃÀ´¼ì²éÊÇ·ñΪºÏ·¨µÄIEʵÀý
var xmlreq = false;
//Èç¹ûActiveX¶ÔÏó¿ÉÓÃ,ÔòʹÓõĿ϶¨ÊÇIE
if (window.ActiveXObject) {
xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
} else {
    // ·ñÔò¿Ï¶¨Ê¹ÓÃJavaSript´¦Àí·½·¨
xmlreq=new XMLHttpRequest();
}
·½·¨Èý:
//´´½¨Ò»¸ö²¼¶ûÐͱäÁ¿,ÓÃÀ´¼ì²éÊÇ·ñΪºÏ·¨µÄIEʵÀý
var xmlreq = false;
//
if (window.XMLHttpRequest) {
// Èç¹ûʹÓõÄÊÇ·ÇIEä¯ÀÀÆ÷,Ôò´´½¨Ò»¸ö¸Ã¶ÔÏóµÄJavaSriptʵÀý
xmlreq = new XMLHttpRequest();
} else if (window.ActiveXObject) {
// Create XMLHttpRequest via MS ActiveX
try {
// Èç¹ûJavaScriptµÄ°æ±¾´óÓÚ5
xmlreq = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e1) {


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