Ajax入门

function ajaxFunction() {
 var xmlHttp;
 try {
  // Firefox, Opera 8.0+, Safari
  xmlHttp = new XMLHttpRequest();
 } catch (e) {
  // Internet Explorer
  try {
   xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (e) {
   try {
    xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
   } catch (e) {
    alert("您的浏览器不支持AJAX！");
    return false;
   }
  }
 }
 xmlHttp.onreadystatechange = function() {
  if (xmlHttp.readyState == 4) {
   document.myForm.time.value = xmlHttp.responseText;
  }
 }
 var url = "/Ajax/userServlet";
 xmlHttp.open("GET", url, true);
 xmlHttp.send(null);
}

接收servlet，out.write(date);参数