javascript 學習筆記（四）倒計時程式

最後更新：2018-12-06 來源：互聯網

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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，但是這樣返回的資料不正確！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">到期日</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>

html部分代碼：可在文字框中輸入倒計時的時間，如果目前時間小於截止時間，則正常返回，反之，則返回距離到期日到現在的時間

<p><label for="deadline">到期日</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：

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，但是這樣返回的資料不正確！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;}

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