Javascript：日期對象（Date）的基本用法，javascriptdate

最後更新：2015-02-06 來源：互聯網

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本文代碼整理自w3school：http://www.w3school.com.cn

1.擷取當前日期：

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

2.擷取時間戳記（毫秒）：

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

3.設定年月日（年為必選，月日為可選）：

var d = new Date();  d.setFullYear(2012,3,16)  document.write(d);  document.write("<br/>");  document.write(d.getTime());

4.返回當前星期幾：

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

5.日期對象的比較：

function compareDate(){    var oneday = new Date();    oneday.setFullYear(2015,2,26);    var currentday = new Date();    if (oneday<currentday){      alert("before");    }else{      alert("after");    }  }

：

範例程式碼：

<!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 日期對象</title><head>  <style>    body {background-color:#e6e6e6}  </style></head><body onload="startTime()">  <h3>（一）返回當前的日期</h3>  <script>  document.write("Current time: "+new Date());  </script>  <h3>（二）返回時間戳記（毫秒）</h3>  <script>  document.write(new Date().getTime());  </script>  <h3>（三）設定年月日</h3>  <script>  var d = new Date();  d.setFullYear(2012,3,16)  document.write(d);  document.write("<br/>");  document.write(d.getTime());  </script>  <h3>（四）將當日的日期（根據 UTC）轉換為字串</h3>  <script>  var d2 = new Date()  document.write (d2.toUTCString())  </script>  <h3>（五）返回當前星期幾</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）顯示一個時間鐘錶</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）日期對象的比較</h3>  <p>2015.3.26與目前時間的關係？</p>  <button onclick = "compareDate()">比較</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>

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Javascript：日期對象（Date）的基本用法，javascriptdate

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