用.net 处理xmlHttp发送异步请求

2025/12/29 23:07:38 人评论次

们要达到的目的是点击按钮，获得服务器的当前时间，aspx的html如下：
Html
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Linkedu.Web.WebWWW.Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>测试</title>
    <script language="javascript" src="javascript/prototype/extras-array.js"></script>
   <script language="javascript" src="javascript/xmlHttp.js"></script>
   <script language="javascript" src="javascript/eventRouter.js"></script>
    <script language="javascript" src="Default.js"></script>
    <script language="javascript">

    </script>
</head>
<body>
    <form id="form1" runat="server">
        用Post方式获得服务器的当前时间
        <input id="btnTestPost" type="button" value="Post" />
        用Get方式获得服务器的当前时间
        <input id="btnTestGet" type="button" value="Get" />
        <div id="divResult"></div>
</form>
</body>
</html>

要用javascript 发送xmlHttp 请求必须解决的问题是跨浏览器的支持。我们把xmlHttp的发送封装在一个javascript对象中，同时在这个对象中解决了跨浏览器支持的问题。代码如下：

xmlHttp对象
/**//*
url-loading object and a request queue built on top of it
*/

/**//* namespacing object */
var net=new Object();

net.READY_STATE_UNINITIALIZED=0;
net.READY_STATE_LOADING=1;
net.READY_STATE_LOADED=2;
net.READY_STATE_INTERACTIVE=3;
net.READY_STATE_COMPLETE=4;

/**//*--- content loader object for cross-browser requests ---*/
net.xmlHttp=function(url, onload, params, method, contentType, onerror){
this.req=null;
this.onload=onload;
this.onerror=(onerror) ? onerror : this.defaultError;
if(typeof(method) == "undefined" || method == null)
{
method = "POST";
}
this.loadXMLDoc(url, params, method, contentType);
}

net.xmlHttp.prototype.loadXMLDoc=function(url, params, method, contentType){
if (!method){
    method="GET";
}
if (!contentType && method=="POST"){
    contentType='application/x-www-form-urlencoded';
}
if (window.XmlHttpRequest){
    this.req=new XmlHttpRequest();
} else if (window.ActiveXObject){
    this.req=new ActiveXObject("Microsoft.xmlHttp");
}
if (this.req){
    try{
      var loader=this;
      this.req.onreadystatechange=function(){
        net.xmlHttp.onReadyState.call(loader);
      }
      this.req.open(method,url,true);
    &nb