javascript 學習筆記（四）倒計時程序代碼

2019-11-20 23:51:46

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首先看全部完整代碼：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type" /> <title>countDown test</title> <script type="text/javascript"> function countDown(endDate) { var now = new Date(); var deadtime = document.getElementById(endDate); var deadline = new Date(deadtime.value); //本地時間與格林威治標準時間 (GMT) 的分鐘差 var timeDiff = now.getTimezoneOffset(); //此處有些不解，如果把分鐘差轉化成毫秒應該是timeDiff*60*1000，但是這樣返回的數據不正確！ var leave = Math.abs(deadline.getTime() - now.getTime() + timeDiff*60); var minute = 1000 * 60; var hour = minute * 60; var day = hour * 24; var countDay = Math.floor(leave/day); //var countHour = Math.floor((leave - day*countDay)/hour); 兩種計算思路 var countHour = Math.floor(leave/hour - countDay*24); var countMinute = Math.floor(leave/minute) - countDay*24*60 - countHour*60; var countSecond = Math.floor(leave/1000) - countDay*24*60*60 - countHour*60*60 - countMinute*60; var outStr = ""; if(deadline < now) { outStr = "距離"+deadtime.value+"已有"+countDay+"天"+countHour+"小時"+countMinute+"分"+countSecond+"秒"; } else { outStr = "距離"+deadtime.value+"還差"+countDay+"天"+countHour+"小時"+countMinute+"分"+countSecond+"秒"; } var showTime = document.getElementById("showTime"); showTime.innerHTML = outStr; } </script> </head> <body> <p> <label for="deadline">截止日期</label> <input type="text" value="2011-06-11" id="deadline" /> <input type="button" value="開始倒計時" onclick="window.setInterval('countDown(/'deadline/')', 1000)" /></p> <p id="showTime"></p> </body> </html>

[Ctrl+A 全選注:如需引入外部Js需刷新才能執行]

html部分代碼：
可在文本框中輸入倒計時的時間，如果當前時間小于截止時間，則正常返回，反之，則返回距離截止日期到現在的時間

復制代碼代碼如下:

 
<p> 
<label for="deadline">截止日期</label> 
<input type="text" value="2011-06-11" id="deadline" /> 
<input type="button" value="開始倒計時" onclick="window.setInterval('countDown(/'deadline/')', 1000)" /> 
</p> 
<p id="showTime"></p> 

javascript部分代碼：

復制代碼代碼如下:

 
function countDown(endDate) { 
var now = new Date(); 
var deadtime = document.getElementById(endDate); 
var deadline = new Date(deadtime.value); 
//本地時間與格林威治標準時間 (GMT) 的分鐘差 
var timeDiff = now.getTimezoneOffset(); 
//此處有些不解，如果把分鐘差轉化成毫秒應該是timeDiff*60*1000，但是這樣返回的數據不正確！ 
var leave = Math.abs(deadline.getTime() - now.getTime() + timeDiff*60); 
var minute = 1000 * 60; 
var hour = minute * 60; 
var day = hour * 24; 
var countDay = Math.floor(leave/day); 
//var countHour = Math.floor((leave - day*countDay)/hour); 兩種計算思路 
var countHour = Math.floor(leave/hour - countDay*24); 
var countMinute = Math.floor(leave/minute) - countDay*24*60 - countHour*60; 
var countSecond = Math.floor(leave/1000) - countDay*24*60*60 - countHour*60*60 - countMinute*60; 
var outStr = ""; 
if(deadline < now) { 
outStr = "距離"+deadtime.value+"已有"+countDay+"天"+countHour+"小時"+countMinute+"分"+countSecond+"秒"; 
} else { 
outStr = "距離"+deadtime.value+"還差"+countDay+"天"+countHour+"小時"+countMinute+"分"+countSecond+"秒"; 
} 
var showTime = document.getElementById("showTime"); 
showTime.innerHTML = outStr; 
} 