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var xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); 
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var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
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var xmlhttp = new XMLHttpRequest();
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var xmlhttp = false; //´´½¨Ò»¸öбäÁ¿ request ²¢¸³Öµ false¡£Ê¹Óà false ×÷ΪÅжÏÌõ¼þ£¬Ëü±íʾ»¹Ã»Óд´½¨ XMLHttpRequest ¶ÔÏó¡£
function CreateXMLHttp(){
try{
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}
catch (e){
try{
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}
catch (e){
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}
catch (failed){
xmlhttp = false;  //Èç¹ûʧ°ÜÔò±£Ö¤ request µÄÖµÈÔȻΪ false¡£
}
}
}
return xmlhttp;
}
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