如下代码：
<!DOCTYPE html>
<html>
<head>
<title>test_ajax</title>
<script type="text/javascript">
function loadXMLDoc() {
var xmlhttp;
if (window.XMLHttpRequest)
{
xmlhttp=new XMLHttpRequest();
}
else
{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","info.txt",true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="myDiv"><h2>use AJAX to modify this text</h2></div>
<button type="button" onclick="loadXMLDoc()">modify</button>
</body>
</html>
正在学习，感谢~
