ajax 实现无刷新页面采集功能代码

var url = "b.aspx";
var param = "a=1&b=2";
var ret = GetRemoteText(url, param, 'post');
// 这个ret就是b.aspx返回的内容，使用吧

 
// 创建XmlHttp对象
function CreateXmlHttp() {
    if (window.XMLHttpRequest)
      return new XMLHttpRequest();
    else {
      var ver = ["MSXML2.XmlHttp.6.0", "MSXML2.XMLHttp.5.0","MSXML2.XMLHttp.4.0",
                 "MSXML2.XMLHttp.3.0","MSXML2.XMLHttp","Microsoft.XMLHttp"];
      for (var i = 0; i < ver.length; i++)
        try  {
          var XmlHttp = new ActiveXObject(ver[i]);
          return XmlHttp;
        }
        catch (oError) {}
    }
    return false;
}

// 访问
function GetRemoteText(url,param,method){
    if(method && method.toLowerCase() == 'post')
      method = 'POST';
    else{
      method = 'GET';
    }
   
    var xml = CreateXmlHttp();
    xml.open(method, url, false);
    if(method == 'POST')
      xml.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
    xml.send(param);
   
    if(xml.readyState == 4 && xml.status == 200)
      return xml.responseText;
    else
      return null;
}