ajax局部刷新为什么出不来效果?请大家指教
<html>
<script language="javascript">
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
var url="/test/test.jsp";
url=url+"&t="+Math.random();
xmlhttp.open("GET",url,true);
xmlhttp.send();//发送请求
}
</script>
<body>
<h2>AJAX</h2>
<button type="button" onclick="loadXMLDoc()">通过 AJAX 改变内容</button>
<div id="myDiv"></div>
</body>
</html>