varrep;

functionshowDatas()
{
if(window.XMLHttpRequest){//firefox,safari
req=newXMLHttpRequest();
}elseif(window.ActiveXObject){//IE
try{
req=newActiveXObject("Microsoft.XMLHTTP");
}catch(e){
req=newActiveXObject("Msxml2.XMLHTTP");
}
}
req.onreadystatechange=callExec;//指定回调函数callExec
req.open("post","<%=basePath%>indexAction!findDatas.action");//创建一个get请求
req.send(null);//发送请求
}
//请求响应回来后,将响应信息显示到页面上
functioncallExec(){
if(req.readyState==4){
//alert(req.responseText);
$("#divId").html(req.responseText);}

}

其中后台的findDatas方法返回一个重组的div串(代码大体如下)：

StringBufferbuffer=newStringBuffer();

buffer.append("<divclass='goodNum_body'>");

buffer.append(...);
buffer.append("</div>");

response.setContentType("text/html;charset=utf-8");
out=response.getWriter();
out.print(buffer.toString());
out.flush();

----------------------------------以下为原生态ajax运用模版-----------------------------------------

<scripttype="text/javascript">
varxmlhttp;
functionloadXMLDoc(url)
{
xmlhttp=null;
if(window.XMLHttpRequest)
{//codeforallnewbrowsers
xmlhttp=newXMLHttpRequest();
}
elseif(window.ActiveXObject)
{//codeforIE5andIE6
xmlhttp=newActiveXObject("Microsoft.XMLHTTP");
}
if(xmlhttp!=null)
{
xmlhttp.onreadystatechange=state_Change;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}
else
{
alert("YourbrowserdoesnotsupportXMLHTTP.");
}
}

functionstate_Change()
{
if(xmlhttp.readyState==4)
{//4="loaded"
if(xmlhttp.status==200)
{//200=OK
//...ourcodehere... } else { alert("ProblemretrievingXMLdata"); } } } </script>