// JScript 文件
//cearte XMLHttp object;
function createXMLHttp() {

    if (window.XMLHttpRequest) {
        return new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        var aVersions = [
            "MSXML2.XMLHttp.4.0", "MSXML2.XMLHttp.3.0",
            "MSXML2.XMLHttp", "Microsoft.XMLHttp"];

        for (var i = 0; i < aVersions.length; i++) {
            try {
                var oXmlHttp = new ActiveXObject(aVersions[i]);
                return oXmlHttp;
            } catch (oError) {
                //
            }
        }
    }
    throw new Error("系统没有安装XMLHttp");
}