request.html文件：
<html>
<head>
<script type="text/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.getElementByIdx_x('A1').innerHTML=xmlhttp.status;
document.getElementByIdx_x('A2').innerHTML=xmlhttp.statusText;
document.getElementByIdx_x("myDiv").innerHTML=xmlhttp.responseText;
}
}
//get提交
xmlhttp.open("GET","response.html",true);
//get方式可以通过?a=b提交参数
//xmlhttp.open("GET","/response.html?t=1",true);
xmlhttp.send();
}
</script>
</head>
<body>
<h2>AJAX</h2>
<button type="button" onclick="loadXMLDoc()">请求数据</button>
<p><b>Response Text</b>
<span id="myDiv"></span>
</p>
<p><b>Status:</b>
<span id="A1"></span>
</p>
<p><b>Status Text:</b>
<span id="A2"></span>
</p>
</body>
</html>
response.html页面：
Hello,Ajax
运行httpserver或者tomcat等中间,访问resquest.html页面
点击请求数据后：
