获取XMLhttpRequest方法

[size=medium][/size]var request = false;
function getXMLHttpRequest() {
try {
request = new ActiveXObject("MSXML2.XMLHTTP");
}
catch (e) {
try {
request = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e1) {
request = false;
}
}
if (!request && typeof XMLHttpRequest != "undefined") {
request = new XMLHttpRequest();
}

return request;
}