ajax

<script type="text/javascript">
 
 var xmlHttpRequest = null; //声明一个空对象以接收XMLHttpRequest对象
 
 function ajaxSubmit()
 {
  if(window.ActiveXObject) // IE浏览器
  {
   xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
  }
  else if(window.XMLHttpRequest) //除IE外的其他浏览器实现
  {
   xmlHttpRequest = new XMLHttpRequest();
  }
  
  if(null != xmlHttpRequest)
  {
   var v1 = document.getElementById("value1ID").value;
   var v2 = document.getElementById("value2ID").value;
   
   xmlHttpRequest.open("POST", "AjaxServlet", true);
   //关联好ajax的回调函数

//如果用get方式的话->xmlHttpRequest.open("GET","AjaxServlet?vi=" + v1 +"&v2=" + v2,true)
   xmlHttpRequest.onreadystatechange = ajaxCallback;
   
   //真正向服务器端发送数据
   // 使用post方式提交，必须要加上如下一行
   xmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
   xmlHttpRequest.send("v1=" + v1 + "&v2=" + v2);
  }
 }
 
 function ajaxCallback()
 {
  if(xmlHttpRequest.readyState == 4)
  {
   if(xmlHttpRequest.status == 200)
   {
    var responseText = xmlHttpRequest.responseText;
    
    document.getElementById("div1").innerHTML = responseText;
   }
  }
 }
 
 </script>