Javascript：日期对象（Date）的基本用法

1.获取当前日期：

示例代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"""><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(2012,3,16) 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>2015.3.26与当前时间的关系？</p> <button onclick = "compareDate()">比较</button> <script> function compareDate(){var oneday = new Date();oneday.setFullYear(2015,2,26);var currentday = new Date();if (oneday<currentday){alert("before");}else{alert("after");} } </script></body></html>

，选择自己所爱的，爱自己所选择的。

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