ajax示例

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<html>
<head>
<script type="text/javascript">
var xmlhttp;
function loadXMLDoc(url)
{
xmlhttp=null;
if (window.XMLHttpRequest)
{// code for Firefox, Opera, IE7, etc.
xmlhttp=new XMLHttpRequest();
}
else if (window.ActiveXObject)
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
if (xmlhttp!=null)
{
xmlhttp.onreadystatechange=state_Change;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}
else
{
alert("Your browser does not support XMLHTTP.");
}
}

function state_Change()
{
if (xmlhttp.readyState==4)
{// 4 = "loaded"
if (xmlhttp.status==200)
{// 200 = "OK"
document.getElementById('T1').innerHTML=xmlhttp.responseText;
}
else
{
alert("Problem retrieving data:" + xmlhttp.statusText);
}
}
}
</script>
</head>

<body onload="loadXMLDoc('/example/ajax/test_xmlhttp.txt')">
<div id="T1" style="border:1px solid black;height:40;width:300;padding:5"></div><br />
<button onclick="loadXMLDoc('/example/ajax/test_xmlhttp2.txt')">Click</button>
</body>

</html>

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