Ajax通用模板实现代码

<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) { 
// document.getElementById("results").innerHTML = xmlHttp.responseText; 
// alert("The server replied with:" + xmlHttp.responseText); 
} 
} 

} 
</script>