如何定时读取服务器上的文件,显示在页面上?

定时就要用到window下的东西了..然后读取网页上的东西.

解决方案 »

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我在LINUX上用PHP编程.不知该怎么实现.现在用while循环来读文件然后再显示,这样速度相当慢.
我用AJAX读取得，用了个setTimeOut()方法来调用。
具体怎么实现的能告诉我吗?我看了点AJAX,但不会实现.多谢了!
<html>
<head>
<title>News</title>
</head>
<body>
<script type="text/javascript">
function display(){
var a = document.getElementById('news');
if(a.style.display == 'block'){
a.style.display = 'none';
}
else{
a.style.display = 'block';
update_news_content();
}
}

function eval_js_contenu(ch){
        var tab_ch = ch.split("<script");
    for (var i=1; i<tab_ch.length; i++){
         var code_js = tab_ch[i];
         code_js = code_js.substring(code_js.indexOf(">")+1, code_js.indexOf("</"+"script>"));
         eval(code_js);
    }
}
function AJAXRequest(page,retfonc,methode,data,async){
        if (!async) async = false;
        var xhr_object = null;
        if(window.XMLHttpRequest) // Firefox
        xhr_object = new XMLHttpRequest();
    else if(window.ActiveXObject) // Internet Explorer
        xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
    else{
        alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest...");
        return;
        }
    if (data=="")
data=null;
    if(methode == "GET" && data != null){
        page += "?"+data;
        data = null;
        }
    xhr_object.open(methode, page, !async);
    xhr_object.onreadystatechange = function(){
    if(xhr_object.readyState == 4) {
     var RetAjax=xhr_object.responseText;
     eval(retfonc+'(RetAjax);');
                }
        }
    if(methode == "POST")
         xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    xhr_object.send(data);
}

function interface_replace_data(ch) {
var regStart = //g;
var regEnd = //g;
var aryStartComment = new Array();
var aryContent = new Array();
aryStartComment = ch.match(regStart);
aryContent = ch.split(regStart);
if(aryStartComment.length == aryContent.length) {
for(var i = 0 ; i < aryContent.length ; i++) {
     var divId = aryStartComment[i].replace("","");
     var divContent = aryContent[i].replace(regEnd,"");
     var oDiv = document.getElementById(divId);
     oDiv.innerHTML = divContent;
}
} else {
for(var i = 0 ; i < aryContent.length ; i++) {
var divId = aryStartComment[i].replace("","");
var divContent = aryContent[i+1].replace(regEnd,"");
var oDiv = document.getElementById(divId);
oDiv.innerHTML = divContent;
}
}
        eval_js_contenu(ch);
    }
function update_news_content(){
AJAXRequest("data.php","interface_replace_data","POST","action=update_news");
}
SET_DHTML("news");
     </script>
<a href='javascript:display();'>display</a>
<div id="news" style="overflow:hidden; width: 243px;height: 130px; background:#ff00ff;margin: 5px;float:left;display:none;">
<div id="news_content"></div>
<div id="news_temp"></div>
<script type="text/javascript">
var speed = 40;
var news = document.getElementById('news');
var news_content = document.getElementById('news_content');
var news_temp = document.getElementById('news_temp');
function Marquee(){
if(news_temp.offsetHeight-news.scrollTop <= 0){
news.scrollTop-=news_content.offsetHeight;
update_news_content();
}
else{
news.scrollTop++;
}
}
var fun_call = setInterval(Marquee,speed);
news.onmouseover = function(){clearInterval(fun_call)}
news.onmouseout = function(){fun_call = setInterval(Marquee,speed)}
</script>
</div>
</body>
</html>
以前写的一个走马灯广告，但是这样耗费资源
news.onmouseover = function(){clearInterval(fun_call)}
news.onmouseout = function(){fun_call = setInterval(Marquee,speed)}
这两句就可以控制时间
我调试时说程序有错误.在display()处.不知道为啥...
错误不在display()那.但是还是有错.错在哪呢?