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JavaScript日期对象(Date)基本用法示例

2019-11-19 17:53:09
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本文实例讲述了JavaScript日期对象(Date)基本用法。分享给大家供大家参考,具体如下:

1.获取当前日期:

document.write("Current time: "+new Date());

2.获取时间戳(毫秒):

document.write(new Date().getTime());

3.设置年月日(年为必选,月日为可选):

var d = new Date();d.setFullYear(2016,3,16)document.write(d);document.write("<br/>");document.write(d.getTime());

4.返回当前星期几:

document.write(new Date().getDay())

5.日期对象的比较:

function compareDate(){  var oneday = new Date();  oneday.setFullYear(2016,2,26);  var currentday = new Date();  if (oneday<currentday){   alert("before");  }else{   alert("after");  }}

效果图:

示例代码:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta http-equiv="Content-Language" content="zh-cn" /><title>Javascript 日期对象</title><head> <style>  body {background-color:#e6e6e6} </style></head><body onload="startTime()"> <h3>(一)返回当前的日期</h3> <script> document.write("Current time: "+new Date()); </script> <h3>(二)返回时间戳(毫秒)</h3> <script> document.write(new Date().getTime()); </script> <h3>(三)设置年月日</h3> <script> var d = new Date(); d.setFullYear(2016,3,16) document.write(d); document.write("<br/>"); document.write(d.getTime()); </script> <h3>(四)将当日的日期(根据 UTC)转换为字符串</h3> <script> var d2 = new Date() document.write (d2.toUTCString()) </script> <h3>(五)返回当前星期几</h3> <script> var d3=new Date() var weekday=new Array(7) weekday[0]="星期日" weekday[1]="星期一" weekday[2]="星期二" weekday[3]="星期三" weekday[4]="星期四" weekday[5]="星期五" weekday[6]="星期六" document.write(weekday[d3.getDay()]) </script> <h3>(六)显示一个时间钟表</h3> <p id = "time_text"></p> <script>  function startTime(){   var today = new Date();   var y = today.getFullYear();   var M = today.getMonth()+1;   var day = today.getDay();   var h = today.getHours();   var m = today.getMinutes();   var s = today.getSeconds();   m = checkTime(m);   s = checkTime(s);   var content = (y+"/"+M+"/"+day+" "+h+":"+m+":"+s).fontsize(6).fontcolor("red");   document.getElementById("time_text").innerHTML = content;   setTimeout("startTime()",500);  }  function checkTime(i){   if(i<10){    return "0"+i;   }   return i;  } </script> <h3>(七)日期对象的比较</h3> <p>2016.3.26与当前时间的关系?</p> <button onclick = "compareDate()">比较</button> <script> function compareDate(){  var oneday = new Date();  oneday.setFullYear(2016,2,26);  var currentday = new Date();  if (oneday<currentday){   alert("before");  }else{   alert("after");  } } </script></body></html>

PS:这里再为大家推荐几款时间及日期相关工具供大家参考使用:

在线秒表工具:
http://tools.VeVB.COm/bianmin/miaobiao

Unix时间戳(timestamp)转换工具:
http://tools.VeVB.COm/code/unixtime

在线世界各地时间查询:
http://tools.VeVB.COm/zhuanhuanqi/worldtime

更多关于JavaScript相关内容感兴趣的读者可查看本站专题:《JavaScript时间与日期操作技巧总结》《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结

希望本文所述对大家JavaScript程序设计有所帮助。

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