ajax XMLHttpRequest post get

/*ÔÚÓÐÖÐÎIJÎÊýʱ,½ÓÊÕ·½ÐèҪʹÓÃUTF-8·½Ê½¶ÔÊý¾Ý½øÐнâÂë
*²»Ö§³Öpost¸½¼þ
*/
function getXmlHttpRequest() {
    var xmlHttpRequest = null;
    try {
        xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e1) {
        try {
            xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e2) {
            xmlHttpRequest = null;
        }
    }
    if (xmlHttpRequest == null && typeof(XMLHttpRequest) != 'undefined') {
        xmlHttpRequest = new XMLHttpRequest();
    }
    return xmlHttpRequest;
}
/*ʹÓÃpost·½Ê½·¢ËÍÊý¾Ý
*url:submit·¾¶
*arguments:²ÎÊý,Èçname=jese&sex=womanz,ÖÐÎÄÊý¾ÝʱʹÓÃ'name='+getEncodeURIComponent('ÀîËÄ')+'&sex='+getEncodeURIComponent('ÄÐ')½øÐбàÂë
*synchFlag:ͬ²½±ê¼Ç,falseΪͬ²½·½Ê½,trueΪÒì²½·½Ê½
*returnType:·µ»ØÄÚÈÝÀàÐÍ0=responseBody;1=responseStream;2=responseText;3=responseXML
*execute:ΪÒì²½·½Ê½Ìá½»ºóµÄ»Øµ÷º¯Êý,´Ëº¯ÊýÓÃÓÚ´¦Àí·µ»ØÊý¾Ý,¸ñʽΪfunction (obj){},objΪ·µ»ØÄÚÈÝ
*/
function postData(url, arguments, synchFlag, returnType, execute) {
    var xmlHttpRequest = getXmlHttpRequest();
    if (xmlHttpRequest == null) return false;
    xmlHttpRequest.open("POST", url, synchFlag);
    xmlHttpRequest.setRequestHeader("CONTENT-TYPE", "application/x-www-form-urlencoded");
    xmlHttpRequest.setRequestHeader("Content-Length", arguments.length);
    if (synchFlag) {
        xmlHttpRequest.onreadystatechange = function() {
  &nb