var request = window.ActiveXObject ? new ActiveXObject ("Microsoft.XMLHTTP") : (window.XMLHttpRequest  ? new XMLHttpRequest() : null);
    var post = "dfdfdf";
    request.open("POST", "./test.html", false);
    request.onreadystatechange = function(){
        if (request.readyState == 4 && request.status == 200)
        {
            //alert(request.readyState, request.status)
            alert(request.responseText)
        }
    }
    request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    request.setRequestHeader("Content-length", post.length);
    request.setRequestHeader("Connection", "close");
    request.send(post);