[PHP]Ajax实例
ajax.html<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>javascript的Ajax操作2</title>
<meta http-equiv="pragma" content="no-cache"/>
<meta http-equiv="cache-control" content="no-cache"/>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"/>
<meta name="author" content="Jarg Yee <yeshaoting@gmail.com>" />
<script type="text/javascript">
var xmlHttpRequest;//用来装入XMLHttpRequest对象
function Ajax()
{
xmlHttpRequest = createRequestObject();
xmlHttpRequest.open("get", "ajax.php", true);
xmlHttpRequest.onreadystatechange = requestCallBack;
xmlHttpRequest.send();
}
/** 请求回调函数 */
function requestCallBack()
{
/*
0: 请求未初始化
1: 服务器连接已建立
2: 请求已接收
3: 请求处理中
4: 请求已完成，且响应已就绪
*/
switch(xmlHttpRequest.readyState)
{
case 0:
showMessage("请求未初始化");break;
case 1:
showMessage("服务器连接已建立");break;
case 2:
showMessage("请求已接收");break;
case 3:
showMessage("请求处理中");break;
case 4:
showMessage("请求已完成，且响应已就绪");
if(xmlHttpRequest.status == 200)
showMessage(xmlHttpRequest.responseText);
break;
}
}
/** 显示XMLHttpRequest当前状态信息 */
function showMessage(str)
{
var msg = document.getElementById("msg");
msg.innerHTML = msg.innerHTML + "<br/>" + str;
}
/** XMLHttpRequest对象 */
function createRequestObject()
{
var xmlHttpRequest;
if(window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlHttpRequest = new XMLHttpRequest();
}
else if(window.ActiveXObject)
{// code for IE6, IE5
xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
return xmlHttpRequest;
}
</script>
</head>
<body>
<input type="button" value="Ajax提交"/>
<div id="msg">Ajax提交过程:</div>
</body>
</html>
ajax.php
<?php
//header("content-Type: text/html; charset=gb2312");
print "Ajax异步请求内容:ajax内容";
?>
效果:
Ajax提交过程:
请求已接收
请求处理中
请求已完成，且响应已就绪
Ajax异步请求内容:ajax内容
页:
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