function createXmlHttp(){

	var xhobj=false;

	try{

		xhobj=new ActiveXObject("Msxml2.XMLHTTP");

	}catch(e){

		try{

			xhobj=new ActiveXObject("Microsoft.XMLHTTP");

		}catch(e2){

			xhobj=false;

		}

	}

	if(!xhobj&&XMLHttpRequest!='undefined'){

		xhobj=new XMLHttpRequest();

	}

	return xhobj;

}

window.onload=function(){

    document.getElementById("btnClick").onclick=function()

    {

        //第一步创建异步对象。

        var xhr=createXmlHttp();

        xhr.open("get","Modify.ashx",true);

        xhr.setRequestHeader("If-Modified-Since",0);

        xhr.onreadystatechange=function(){

            if(xhr.readyState==4&&xhr.status==200){

                var res=xhr.responseText;

                document.getElementById("divMsg").innerHTML=res;

            }

        }

        //发送请求

        xhr.send(null)

    };

};

window.onload=function(){

    document.getElementById("btnReg").onclick=function(){

        var xhr=createXmlHttp();

        //定义一个转的界面

        var urlPara="05kjdfgsdjf.ashx"

        xhr.open("post",urlPara,true);

        xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

        //5.0设置回调函数。

        xhr.onreadystatechange=function(){

            if(xhr.readyState==4&&xhr.status==200)

            {

                var res=xhr.responseText;

                //处理数据  ......

            }

        }

        //6.0发送请求 name=james & pwd=123

        xhr.send("name="+document.getElementById("txtName").value+"&pwd="+document.getElementById("txtPwd").value);

    }

}