Simple operation of JS date object (get current year, week, time)-JS Tutorial-php.cn

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Simple operation of JS date object (get current year, week, time)

高洛峰

Jan 04, 2017 am 09:50 AM

The example of this article shares with you the method of obtaining the current year, week, and time in JavaScript for your reference. The specific content is as follows

<!DOCTYPE html>
 
<html>
 
  
 
<head>
 
<meta charset="UTF-8">
 
<title></title>
 
</head>
 
  
 
<body>
 
</body>
 
<script type="text/javascript">
 
//日期对象可以储存任意一个日期， 并且可以精确到毫秒数（ 1 / 1000 秒）。
 
  
 
//定义一个时间对象:
 
  
 
//var Udate = new Date();
 
//注意:使用关键字new，Date()的首字母必须大写。 
 
  
 
//使 Udate 成为日期对象，并且已有初始值：当前时间(当前电脑系统时间)。
 
  
 
//如果要自定义初始值，可以用以下方法：
 
var d = new Date(2012, 10, 1);
 
document.write(d + "<br/>");
 
var c = new Date(&#39;Oct 1,2012&#39;);
 
document.write(d + "<br/>");
 
//访问方法语法：“<日期对象><方法>”
//Date 对象中处理时间和日期的常用方法：
// get/setDate():　　　　返回,设置日期
//get/setFullYear(): 返回,设置年份,用四位数表示
// get/setYear(): 返回,设置年份
//get/setMonth(): 返回,设置月份(０:１月,,,,１１:１２月)
//get/setHours(): 返回,设置小时,２４小时制
// get/setMinutes(): 返回,设置分钟数
//get/setSeconds(): 返回,设置秒钟数
// get/setTime(): 返回,设置单位(毫秒为单位)
 
  
 
//1.设置年份方法
//get/setFullYear()返回/设置年份，用四位数表示
var mydate = new Date(); //当前时间
document.write(mydate + "<br/>");
document.write(mydate.getFullYear() + "<br/>"); //输出当前年份
mydate.setFullYear(81); //设置年份
document.write(mydate + "<br/>") //输出年份被设定为８１年
// 不同浏览器，mydate.setFullYear(81)结果不同，
//年份被设定为００８１或８１两种情况。
 
  
 
//注意: 
 
// 结果格式依次为： 星期、 月、 日、 年、 时、 分、 秒、 时区。(火狐浏览器)
// 不同浏览器， 时间格式有差异
 
  
 
//2.设置星期的方法
//getDay() 返回星期，返回的是0-6的数字，0 表示星期天。
//如果要返回相对应“星期”，通过数组完成，代码如下:
var mydate=new Date();//定义日期对象
var weekday=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
// 定义数组对象，给每个数组项赋值
var mynum=mydate.getDay();//返回值存储在变量mynum中　
document.write(mydate.getDay());//输出getDate()获取值
document.write("今天是："+weekday[mynum]);//输出星期几
document.write("<br/>");
 
  
 
//３.设置时间方法
//get/setTime() 返回/设置时间，单位毫秒数，
//计算从 1970 年 1 月 1 日零时到日期对象所指的日期的毫秒数。
//如果将目前日期对象的时间推迟１小时，代码如下：
var mydate=new Date();
document.write("当前时间"+mydate+"<br/>");
mydate.setTime(mydate.getTime()+60*60*1000);
document.write("推迟一小时时间："+mydate);
//注意：一小时６０分，一分６０秒，一秒１０００毫秒；时间推迟一小时就是："x.setTime(x.getTime()+60*60*1000);"    
</script>  
</html>

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