其他-javascript获取表单的信息并用ajax提交

function Pub(){  } Pub.newXMLHttpRequest=function newXMLHttpRequest() {  var xmlreq = false;  if (window.XMLHttpRequest) {      xmlreq = new XMLHttpRequest();  } else if (window.ActiveXObject) {         try {            xmlreq = new ActiveXObject("Msxml2.XMLHTTP");    } catch (e1) {             try {              xmlreq = new ActiveXObject("Microsoft.XMLHTTP");      } catch (e2) {                  alert(e2);      }    }  }  return xmlreq;}Pub.getParams2Str=function getParams2Str(sForm){ var strDiv="";       try {    var objForm=document.forms[sForm];  if (!objForm)    return strDiv;  var elt,sName,sValue;  for (var fld = 0; fld < objForm.elements.length; fld++) {      elt = objForm.elements[fld];          sName=elt.name;      sValue=""+elt.value;      if(fld==objForm.elements.length-1)          strDiv=strDiv + sName+"="+sValue+"";       else             strDiv=strDiv + sName+"="+sValue+"&";   }  }  catch (ex) {    return strDiv;}    return strDiv;}Pub.submitActionWithForm=function(action,sForm){  var req = Pub.newXMLHttpRequest();  req.open("POST", action, false);  req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");   var str = Pub.getParams2Str(sForm);    req.send(str);}