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Ajax中解决IE下缓存无法实时更新显示的问题

2011-07-26 13:53:33| 分类：默认分类 | 标签： |举报 |字号大中小订阅

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使用Ajax开发的朋友可能都有这样的经历，在网页中需要实时刷新数据时，使用ajax在IE中却只能读到一次数据，不能实时显示最新数据，而在Firefox、Opera等浏览器中均没问题，这主要是因为IE的缓存问题，如何解决呢？

1、在请求URL中加入一个动态参数，如时间戳，但在处理程序中不一定非要处理这个时间戳

var url = "你的URL" + "&timestamp=" + new Date().getTime();

2、在程序中禁止浏览器缓存

HTML
    <META HTTP-EQUIV="pragma" CONTENT="no-cache">
    <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache, must-revalidate">
    <META HTTP-EQUIV="expires" CONTENT="Mon, 23 Jan 1978 12:52:30 GMT">
ASP
<%
    Response.Expires = -1
    Response.ExpiresAbsolute = Now() - 1
    Response.cachecontrol = "no-cache"
%>
PHP
    header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
    header("Cache-Control: no-cache, must-revalidate");
    header("Pragma: no-cache");
JSP
    response.setHeader("Pragma","No-Cache");
    response.setHeader("Cache-Control","No-Cache");
    response.setDateHeader("Expires", 0);
C#中禁止cache的方法！
    Response.Buffer=true;
    Response.ExpiresAbsolute=System.DateTime.Now.AddSeconds(-1);
    Response.Expires=0;
    Response.CacheControl="no-cache";

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