var http_request = false;
	function request(){
		http_request = false;
    //開始初始化XMLHttpRequest對象
    if(window.XMLHttpRequest) { //Mozilla 瀏覽器
    http_request = new XMLHttpRequest();
    if (http_request.overrideMimeType) {//設(shè)置MiME類別
        http_request.overrideMimeType('text/xml');
    }
     }
else if (window.ActiveXObject) { // IE瀏覽器
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) { // 異常，創(chuàng)建對象實(shí)例失敗
window.alert("不能創(chuàng)建XMLHttpRequest對象實(shí)例.");
return false;
}
else{
	return http_request;
}
}