javascript处理Ajax对象

var xmlHttpRequest;

function getXmlHttp(){

var xmlhttp=null;

if(window.XmlHttpRequest)

{

xmhttp=new XmlHttpRequest();

}

is(window.ActiveXObject)

{

xmlhttp=new ActiveXObject("Microsoft.XMLHttp");

}

return xmlhttp;

}

 

function populateList(){

var url="ln.jsp?username=williams&password=passw0rd";

if(!xmlHttpRequest)

{

xmlHttpRequest=getXmlHttp();

}

if(!xmlHttpRequest)

return;

xmlHttpRequest.open("GET",url,true);

xmlHttpRequest.onreadyStateChange=getResult;

xmlHttpRequest.send(null);

}

 

function getResult(){

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

{

document.getElementById("ln").innerHTML=xmlHttpRequest.responseText;

}

else

{

............................................................

}

}