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Ajax+php实现动态显示时间

前端代码:

<script type="text/javascript">var xmlHttp;function createXMLHttpRequest(){    if(window.ActiveXObject){        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");    }    else if(window.XMLHttpRequest){        xmlHttp = new XMLHttpRequest();    }}function start(){    createXMLHttpRequest();    var url="getTime.php";    xmlHttp.open("GET",url,true);    xmlHttp.onreadystatechange = callback;    xmlHttp.send(null);}function callback(){    if(xmlHttp.readyState == 4){        if(xmlHttp.status == 200){            document.getElementById("showtime").innerHTML = xmlHttp.responseText;            setTimeout("start()",1000);        }    }}</script><html><head><meta http-equiv="content-type" content="text/html;charset=gb2312" /></head><body><h1>Ajax动态显示时间</h1><input type="button" value="http://www.mamicode.com/开始显示时间" id="go" onclick="start()" /><p>当前时间:<font color="red"><span id="showtime"></span></font></p></body></html>

 

后端代码:

<?phpheader("cache-control:no-cache,must-revalidate");header("Content-Type:text/html;charset=utf-8");$showtime = date("北京时间Y年m月d日H:i:s");echo $showtime;?>

 

Ajax+php实现动态显示时间