页面每隔一段时间自动刷新

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>RAP INDEX</title>
<link rel="stylesheet"
	href="<%=application.getContextPath()%>/css/css.css"
	type="text/css" />
<script
	src="<%=application.getContextPath()%>/js/jquery-1.9.1.min.js"></script>
<script src="<%=application.getContextPath()%>/js/Tab.js"></script>
<script
	src="<%=application.getContextPath()%>/js/my97DatePicker/WdatePicker.js"
	type=text/javascript></script>
<script
	src="<%=application.getContextPath()%>/js/jquery.showLoading.min.js"
	type=text/javascript></script>
<script src="${pageContext.servletContext.contextPath}/js/echarts3/echarts.min.js"></script>
</head>
<title>page auto refresh </title> 
<script type="text/javascript"> 
var t=5; 
function refresh() 
{ 
t=t-1;
document.getElementById("refresh").innerHTML="离下次刷新时间还有 "+t+" 秒";
	if (t==0) { 
		// document.location.reload(); 
		t = 6 ;
	} 
} 
</script>

</head> 
<body onload="window.setInterval(refresh,1000);"> 
<font id="refresh" style="color:blue" >离下次刷新时间还有5秒</font><br/> 
</body> 
</html>

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