3.Ajax标准交互实例
simpleRequest.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TE/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Simple XMLHttpRequest</title>
<script type="text/javascript">
var xmlHttp;
function creatXMLHttpRequest()
{
if (window.ActiveXObject)
{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest)
{
xmlHttp = new XMLHttpRequest();
}
}
function startRequest()
{
creatXMLHttpRequest();
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.open("GET", "simpleResponse.xml", true);
xmlHttp.send(null);
}
function handleStateChange()
{
if(xmlHttp.readyState == 4)
{
if(xmlHttp.status == 200)
{
alert("The server replied with:/r/n" + xmlHttp.responseText);
}
}
}
</script>
</head>
<body>
<form action="#">
<input type="button" value="Start Basic Asynchronous Request" onclick="startRequest();" />
</form>
</body>
</html>
simpleResponse.xml
<?xml version="1.0"?>
<body>
Hello, Ajax!
</body>