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JScript code:

var xhr=false;
if(window.XMLHttpRequest) {
xhr=new XMLHttpRequest();
alert("XMLHttpRequest");//ΪʲôIE7£¬8»áÊÇÕâ¸ö£¿£¿£¿
} else {
try {
xhr=new ActiveXObject("Msxml2.XMLHTTP");//IE6
alert('new ActiveXObject("Msxml2.XMLHTTP");');
}catch(e){
try {
xhr=new ActiveXObject("Microsoft.XMLHTTP");//Õâ¸öIE6Ò²ÐУ¬
alert('new ActiveXObject("Microsoft.XMLHTTP");');
}catch(e){}
}
}
if(!xhr) {
alert("²»Ö§³ÖµÄä¯ÀÀÆ÷");
}
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<html x ......
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