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var xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); 
//ʹÓýÏа汾µÄ IE ´´½¨ IE ¼æÈݵĶÔÏó£¨Msxml2.XMLHTTP£©
var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
//ʹÓýÏÀϰ汾µÄ IE ´´½¨ IE ¼æÈݵĶԣ¨Microsoft.XMLHTTP£©
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var xmlhttp = new XMLHttpRequest();
    ʵ¼ÊÉÏInternet Explorer ʹÓÃÁËÒ»¸öÃûΪ XMLHttp µÄ¶ÔÏ󣬶ø²»ÊÇ XMLHttpRequest ¶ÔÏ󣬶ø Mozilla¡¢Opera¡¢Safari ºÍ ´ó²¿·Ö·Ç Microsoft ä¯ÀÀÆ÷¶¼Ê¹ÓõÄÊǺóÕߣ¨ÏÂÎÄͳ³Æ XMLHttpRequest ¶ÔÏ󣩡£IE7¿ªÊ¼Ò²¿ªÊ¼Ê¹ÓÃXMLHttpRequest ¶ÔÏóÁË¡£
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    ´´½¨¼æÈݶàä¯ÀÀÆ÷µÄ XMLHttpRequest ¶ÔÏó·½·¨
 
var xmlhttp = false; //´´½¨Ò»¸öбäÁ¿ request ²¢¸³Öµ false¡£Ê¹Óà false ×÷ΪÅжÏÌõ¼þ£¬Ëü±íʾ»¹Ã»Óд´½¨ XMLHttpRequest ¶ÔÏó¡£
function CreateXMLHttp(){
try{
xmlhttp = new XMLHttpRequest();  //³¢ÊÔ´´½¨ XMLHttpRequest ¶ÔÏ󣬳ý IE ÍâµÄä¯ÀÀÆ÷¶¼Ö§³ÖÕâ¸ö·½·¨¡£
}
catch (e){
try{
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");  //ʹÓýÏа汾µÄ IE ´´½¨ IE ¼æÈݵĶÔÏó£¨Msxml2.XMLHTTP£©
}
catch (e){
try{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); //ʹÓýÏÀϰ汾µÄ IE ´´½¨ IE ¼æÈݵĶÔÏó£¨Microsoft.XMLHTTP£©¡£
}
catch (failed){
xmlhttp = false;  //Èç¹ûʧ°ÜÔò±£Ö¤ request µÄÖµÈÔȻΪ false¡£
}
}
}
return xmlhttp;
}
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if (!xmlhttp){
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}
else{
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}
 
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