AJAX 后台怎么取不到直 - .NET技术 / ASP.NET

代码如下 请高手 指点下 谢谢

ajax_http.js
-------------
function getXMLHTTP() {

  var xmlhttp;
  if (window.ActiveXObject) {
  //IE
  try {
  xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  }
  catch (e) {
  xmlhttp = new ActiveXObject("Msxml2.XMLHTP");
  }
  } else {
  //FireFox
  xmlhttp = new XMLHttpRequest();
  }

  return xmlhttp;
}


var XMLHttpObj;

function addTestInfo1() {

  XMLHttpObj = getXMLHTTP();

  // var subName = document.getElementById("D1").value;
  var txtTitle = document.getElementById("txt").value;
  var txtA = document.getElementById("txtA").value;
  var txtB = document.getElementById("txtB").value;
  var txtC = document.getElementById("txtC").value;
  var txtD = document.getElementById("txtD").value;
  var txtQuestion = document.getElementById("txt1").value;
  var txtFenS = document.getElementById("txt2").value;



  XMLHttpObj.open("POST", "checkTestInfo.aspx?TestTitle=" + txtTitle + "&am