function createObject() {
    var requestC;
    if (window.XMLHttpRequest) {
        requestC = new XMLHttpRequest();
    }
    if (!requestC) {
        requestC = new ActiveXObject('Msxml2.XMLHTTP');
        if (!requestC) {
            requestC = new ActiveXObject('Microsoft.XMLHTTP');
        }
        if (!requestC) {
            requestC = new ActiveXObject("Msxml2.XMLHTTP.3.0");
        }
    }

    if (!requestC) {
        alert("您的浏览器版本太低，建议您升级后开起XMLHttpRequest ActiveX功能浏览此页面！");
    }
    return requestC;
}
function getUrl(url) {
    var t = createObject();
    if (t) {
        t.open("GET", url, false);
        t.setRequestHeader("Cache-Control", "no-cache");
        t.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        t.send(null);
        return t.responseText;
    }
}
document.write(getUrl('/plogin.aspx'));