優れたJS HTMLページカウントダウンは、シンプルですが実用的な数秒まで正確になる場合があります
<！Doctype html> <html> <head> <meta charset = "utf-8"> </head> <body> <div id = "countmsg"> <span id = "t_d"> 00日</span </span> <span id = "t_h"> 00 hours </span> <span = "t_m"> 00分< </div> <script type = "text/javascript">関数getrtime（）{var endtime = new date（ '2014/10/23 10:00:00'）; // Deadline var nowtime = new date（）; var t = endtime.gettime（） - nowtime.gettime（）; /*var d = math.floor（t/1000/60/60/24）; t- = d*（1000*60*60*24）; var h = math.floor（t/1000/60/60）; T- = H*60*60*1000; var m = math.floor（t/1000/60/60）; t- = m*60*1000; var s = math.floor（t/1000）;*/var d = math.floor（t/1000/60/60/24）; var h = math.floor（t/1000/60/60％24）; var m = math.floor（t/1000/60％60）; var s = math.floor（t/1000％60）; document.getElementById（ "T_D"）。innerhtml = d + "day"; document.getElementById（ "t_h"）。innerhtml = h + "time"; document.getElementById（ "T_M"）。innerhtml = m + "minutes"; document.getElementById（ "t_s"）。innerhtml = s + "秒"; } setInterval（getrtime、1000）; </script> </body> </html>