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javascript时间自动刷新实现原理与步骤

2013-01-06 00:00 786 查看
项目结构：


运行效果：


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代码部分：

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/Clock/WebContent/index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> 
<% 
String path = request.getContextPath(); 
String basePath = request.getScheme() + "://" 
+ request.getServerName() + ":" + request.getServerPort() 
+ path + "/"; 
%> 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<base href="<%=basePath%>" /> 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
<title>Insert title here</title> 
</head> 
<body> 
<span id="clock"> </span> 
</body> 
<script type="text/javascript" src="<%=basePath%>js/clock/clock.js" charset="UTF-8"></script> 
</html>

/Clock/WebContent/js/clock/clock.js
/** 
* 时间显示 
* @date 2012-12-31 
* @author hongten(hongtenzone@foxmail.com) 
* 
* @returns 
*/ 
function Clock() { 
var date = new Date(); 
this.year = date.getFullYear(); 
this.month = date.getMonth() + 1; 
this.date = date.getDate(); 
this.day = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六")[date.getDay()]; 
this.hour = date.getHours() < 10 ? "0" + date.getHours() : date.getHours(); 
this.minute = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes(); 
this.second = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds(); 

// 日期:2012-12-31-17:03:18 星期一 
this.toString = function() { 
return "日期:" + this.year + "-" + this.month + "-" + this.date + "-" + this.hour + ":" + this.minute + ":" + this.second + " " + this.day; 
}; 

// 2012-12-31 
this.toSimpleDate = function() { 
return this.year + "-" + this.month + "-" + this.date; 
}; 

// 2012-12-31 17:04:03 
this.toDetailDate = function() { 
return this.year + "-" + this.month + "-" + this.date + " " + this.hour + ":" + this.minute + ":" + this.second; 
}; 

this.display = function(ele) { 
var clock = new Clock(); 
ele.innerHTML = clock.toString(); 
window.setTimeout(function() { 
clock.display(ele); 
}, 1000); 
}; 
} 

// <span id="clock"> </span> 
var clock = new Clock(); 
clock.display(document.getElementById("clock"));

我个人认为这个在web中很实用...所以推荐给大家啦...
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