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實現倒計時效果需要掌握js中的兩個知識點：
1、setTimeout函數 每隔1秒鐘更新秒鐘時間
2、Date對象 計算時間差
下面貼出 元旦倒計時代碼
<!DOCTYPE html><html> <head> <title>example.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> <script> //定義計時器，每隔1秒鐘調用timer函數 var timerCount= window.setTimeout("timer()",1000); function timer(){ var date=new Date("2017","1","1","0","0","0"); var deadlineTime=date.getTime(); var nowDate=new Date(); var nowTime=nowDate.getTime(); var distTime=deadlineTime-nowTime; //判斷是否到達時間期限 if(distTime>0){ var d=Math.floor(distTime/1000/3600/24); var h=Math.floor(distTime/1000/3600%24); var m=Math.floor(distTime/1000/60%60); var s=Math.floor(distTime/1000%60); var str="距離2017年元旦還有"+d+"天"+h+"時"+m+"分"+s+"秒"; document.getElementById("timeout").innerHTML=str; timerCount= window.setTimeout("timer()",1000); } else{ //到達時間期限的時候清楚計時器； window.clearTimeout(timerCount); alert("時間已到"); } } </script> </head> <body> <p id="timeout"> </p></html>
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