显示长日期格式的系统时间
长格式是以“YYYY年MM月DD日 星期W”的格式来显示的
应用JavaScript中的Date对象来实现的，创建一个Date对象时，如果该对象不包含任何构造参数，并且不通过setXXX()方法设置该对象中的年，月，日等值，那么该对象则表示当前系统时间的Date对象；
<%@ page language="java" import="java.util.*" 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">
<html>
<head>
<base href="<%=basePath%>">
<title>显示长日期格式的系统时间</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
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<meta http-equiv="description" content="This is my page">
<link href="CSS/style.css" rel="stylesheet">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script language="javascript">
/**
*显示长日期格式的系统日期
*/
function getLangDate(){
var dateObj = new Date(); //表示当前系统时间的Date对象
var year = dateObj.getFullYear(); //当前系统时间的完整年份值
var month = dateObj.getMonth()+1; //当前系统时间的月份值
var date = dateObj.getDate(); //当前系统时间的月份中的日
var day = dateObj.getDay(); //当前系统时间中的星期值
var weeks = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var week = weeks[day]; //根据星期值，从数组中获取对应的星期字符串
if(month<10){
month="0"+month;
}
if(date<10){
date="0"+date;
}
var newDate = year+"年"+month+"月"+date+"日 "+week;
document.getElementById("dateStr").innerHTML = newDate;
}
</script>
</head>
<body onLoad="getLangDate()">
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在获得年份时，使用的是getFullYear()方法而不是用getYear()方法，getFullYear()方法以绝对数字的形式返回年份值